literature review example for education

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Education Literature Review: Education Literature Review

What does this guide cover.

Writing the literature review is a long, complex process that requires you to use many different tools, resources, and skills.

This page provides links to the guides, tutorials, and webinars that can help you with all aspects of completing your literature review.

The Basic Process

These resources provide overviews of the entire literature review process. Start here if you are new to the literature review process.

• Literature Reviews Overview : Writing Center
• How to do a Literature Review : Library
• Video: Common Errors Made When Conducting a Lit Review (YouTube)  

The Role of the Literature Review

Your literature review gives your readers an understanding of the evolution of scholarly research on your topic.

In your literature review you will:

• survey the scholarly landscape
• provide a synthesis of the issues, trends, and concepts
• possibly provide some historical background

Review the literature in two ways:

• Section 1: reviews the literature for the Problem
• Section 3: reviews the literature for the Project

The literature review is NOT an annotated bibliography. Nor should it simply summarize the articles you've read. Literature reviews are organized thematically and demonstrate synthesis of the literature.

For more information, view the Library's short video on searching by themes:

Short Video: Research for the Literature Review

(4 min 10 sec) Recorded August 2019 Transcript 

Search for Literature

The iterative process of research:

• Find an article.
• Read the article and build new searches using keywords and names from the article.
• Mine the bibliography for other works.
• Use “cited by” searches to find more recent works that reference the article.
• Repeat steps 2-4 with the new articles you find.

These are the main skills and resources you will need in order to effectively search for literature on your topic:

• Subject Research: Education by Jon Allinder Last Updated Aug 7, 2023 4830 views this year
• Keyword Searching: Finding Articles on Your Topic by Lynn VanLeer Last Updated Sep 12, 2023 24443 views this year
• Google Scholar by Jon Allinder Last Updated Aug 16, 2023 15452 views this year
• Quick Answer: How do I find books and articles that cite an article I already have?
• Quick Answer: How do I find a measurement, test, survey or instrument?

Video: Education Databases and Doctoral Research Resources

(6 min 04 sec) Recorded April 2019 Transcript 

Staying Organized

The literature review requires organizing a variety of information. The following resources will help you develop the organizational systems you'll need to be successful.

• Organize your research
• Citation Management Software

You can make your search log as simple or complex as you would like.  It can be a table in a word document or an excel spread sheet.  Here are two examples.  The word document is a basic table where you can keep track of databases, search terms, limiters, results and comments.  The Excel sheet is more complex and has additional sheets for notes, Google Scholar log; Journal Log, and Questions to ask the Librarian.  

• Search Log Example Sample search log in Excel
• Search Log Example Sample search log set up as a table in a word document.
• Literature Review Matrix with color coding Sample template for organizing and synthesizing your research

Writing the Literature Review

The following resources created by the Writing Center and the Academic Skills Center support the writing process for the dissertation/project study. 

• Critical Reading
• What is Synthesis 
• Walden Templates
• Quick Answer: How do I find Walden EdD (Doctor of Education) studies?
• Quick Answer: How do I find Walden PhD dissertations?

Beyond the Literature Review

The literature review isn't the only portion of a dissertation/project study that requires searching. The following resources can help you identify and utilize a theory, methodology, measurement instruments, or statistics.

• Education Theory by Jon Allinder Last Updated May 17, 2024 602 views this year
• Tests & Measures in Education by Kimberly Burton Last Updated Nov 18, 2021 47 views this year
• Education Statistics by Jon Allinder Last Updated Feb 22, 2022 60 views this year
• Office of Research and Doctoral Services

Books and Articles about the Lit Review

The following articles and books outline the purpose of the literature review and offer advice for successfully completing one.

• Chen, D. T. V., Wang, Y. M., & Lee, W. C. (2016). Challenges confronting beginning researchers in conducting literature reviews. Studies in Continuing Education, 38(1), 47-60. https://doi.org/10.1080/0158037X.2015.1030335 Proposes a framework to conceptualize four types of challenges students face: linguistic, methodological, conceptual, and ontological.
• Randolph, J.J. (2009). A guide to writing the dissertation literature review. Practical Assessment, Research & Evaluation 14(13), 1-13. Provides advice for writing a quantitative or qualitative literature review, by a Walden faculty member.
• Torraco, R. J. (2016). Writing integrative literature reviews: Using the past and present to explore the future. Human Resource Development Review, 15(4), 404–428. https://doi.org/10.1177/1534484316671606 This article presents the integrative review of literature as a distinctive form of research that uses existing literature to create new knowledge.
• Wee, B. V., & Banister, D. (2016). How to write a literature review paper?. Transport Reviews, 36(2), 278-288. http://doi.org/10.1080/01441647.2015.1065456 Discusses how to write a literature review with a focus on adding value rather and suggests structural and contextual aspects found in outstanding literature reviews.
• Winchester, C. L., & Salji, M. (2016). Writing a literature review. Journal of Clinical Urology, 9(5), 308-312. https://doi.org/10.1177/2051415816650133 Reviews the use of different document types to add structure and enrich your literature review and the skill sets needed in writing the literature review.
• Xiao, Y., & Watson, M. (2017). Guidance on conducting a systematic literature review. Journal of Planning Education and Research. https://doi.org/10.1177/0739456X17723971 Examines different types of literature reviews and the steps necessary to produce a systematic review in educational research.

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Literature Review: Conducting & Writing

• Sample Literature Reviews
• Steps for Conducting a Lit Review
• Finding "The Literature"
• Organizing/Writing
• APA Style This link opens in a new window
• Chicago: Notes Bibliography This link opens in a new window
• MLA Style This link opens in a new window

Sample Lit Reviews from Communication Arts

Have an exemplary literature review.

• Literature Review Sample 1
• Literature Review Sample 2
• Literature Review Sample 3

Have you written a stellar literature review you care to share for teaching purposes?

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Please contact Britt McGowan at [email protected] for inclusion in this guide. All disciplines welcome and encouraged.

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Chapter 1: Introduction

Learning objectives.

At the conclusion of this chapter, you will be able to:

• Identify the purpose of the literature review in  the research process
• Distinguish between different types of literature reviews

1.1 What is a Literature Review?

Pick up nearly any book on research methods and you will find a description of a literature review.  At a basic level, the term implies a survey of factual or nonfiction books, articles, and other documents published on a particular subject.  Definitions may be similar across the disciplines, with new types and definitions continuing to emerge.  Generally speaking, a literature review is a:

• “comprehensive background of the literature within the interested topic area…” ( O’Gorman & MacIntosh, 2015, p. 31 ).
• “critical component of the research process that provides an in-depth analysis of recently published research findings in specifically identified areas of interest.” ( House, 2018, p. 109 ).
• “written document that presents a logically argued case founded on a comprehensive understanding of the current state of knowledge about a topic of study” ( Machi & McEvoy,  2012, p. 4 ).

As a foundation for knowledge advancement in every discipline, it is an important element of any research project.  At the graduate or doctoral level, the literature review is an essential feature of thesis and dissertation, as well as grant proposal writing.  That is to say, “A substantive, thorough, sophisticated literature review is a precondition for doing substantive, thorough, sophisticated research…A researcher cannot perform significant research without first understanding the literature in the field.” ( Boote & Beile, 2005, p. 3 ).  It is by this means, that a researcher demonstrates familiarity with a body of knowledge and thereby establishes credibility with a reader.  An advanced-level literature review shows how prior research is linked to a new project, summarizing and synthesizing what is known while identifying gaps in the knowledge base, facilitating theory development, closing areas where enough research already exists, and uncovering areas where more research is needed. ( Webster & Watson, 2002, p. xiii )

A graduate-level literature review is a compilation of the most significant previously published research on your topic. Unlike an annotated bibliography or a research paper you may have written as an undergraduate, your literature review will outline, evaluate and synthesize relevant research and relate those sources to your own thesis or research question. It is much more than a summary of all the related literature.

It is a type of writing that demonstrate the importance of your research by defining the main ideas and the relationship between them. A good literature review lays the foundation for the importance of your stated problem and research question.

Literature reviews:

• define a concept
• map the research terrain or scope
• systemize relationships between concepts
• identify gaps in the literature ( Rocco & Plathotnik, 2009, p. 128 )

The purpose of a literature review is to demonstrate that your research question  is meaningful. Additionally, you may review the literature of different disciplines to find deeper meaning and understanding of your topic. It is especially important to consider other disciplines when you do not find much on your topic in one discipline. You will need to search the cognate literature before claiming there is “little previous research” on your topic.

Well developed literature reviews involve numerous steps and activities. The literature review is an iterative process because you will do at least two of them: a preliminary search to learn what has been published in your area and whether there is sufficient support in the literature for moving ahead with your subject. After this first exploration, you will conduct a deeper dive into the literature to learn everything you can about the topic and its related issues.

Literature Review Tutorial

1.2 Literature Review Basics

An effective literature review must:

• Methodologically analyze and synthesize quality literature on a topic
• Provide a firm foundation to a topic or research area
• Provide a firm foundation for the selection of a research methodology
• Demonstrate that the proposed research contributes something new to the overall body of knowledge of advances the research field’s knowledge base. ( Levy & Ellis, 2006 ).

All literature reviews, whether they are qualitative, quantitative or both, will at some point:

• Introduce the topic and define its key terms
• Establish the importance of the topic
• Provide an overview of the amount of available literature and its types (for example: theoretical, statistical, speculative)
• Identify gaps in the literature
• Point out consistent finding across studies
• Arrive at a synthesis that organizes what is known about a topic
• Discusses possible implications and directions for future research

1.3 Types of Literature Reviews

There are many different types of literature reviews, however there are some shared characteristics or features.  Remember a comprehensive literature review is, at its most fundamental level, an original work based on an extensive critical examination and synthesis of the relevant literature on a topic. As a study of the research on a particular topic, it is arranged by key themes or findings, which may lead up to or link to the  research question.  In some cases, the research question will drive the type of literature review that is undertaken.

The following section includes brief descriptions of the terms used to describe different literature review types with examples of each.   The included citations are open access, Creative Commons licensed or copyright-restricted.

1.3.1 Types of Review

1.3.1.1 conceptual.

Guided by an understanding of basic issues rather than a research methodology. You are looking for key factors, concepts or variables and the presumed relationship between them. The goal of the conceptual literature review is to categorize and describe concepts relevant to your study or topic and outline a relationship between them. You will include relevant theory and empirical research.

Examples of a Conceptual Review:

• Education : The formality of learning science in everyday life: A conceptual literature review. ( Dohn, 2010 ).
• Education : Are we asking the right questions? A conceptual review of the educational development literature in higher education. ( Amundsen & Wilson, 2012 ).

1.3.1.2 Empirical

An empirical literature review collects, creates, arranges, and analyzes numeric data reflecting the frequency of themes, topics, authors and/or methods found in existing literature. Empirical literature reviews present their summaries in quantifiable terms using descriptive and inferential statistics.

Examples of an Empirical Review:

• Nursing : False-positive findings in Cochrane meta-analyses with and without application of trial sequential analysis: An empirical review. ( Imberger, Thorlund, Gluud, & Wettersley, 2016 ).
• Education : Impediments of e-learning adoption in higher learning institutions of Tanzania: An empirical review ( Mwakyusa & Mwalyagile, 2016 ).

1.3.1.3 Exploratory

Unlike a synoptic literature review, the purpose here is to provide a broad approach to the topic area. The aim is breadth rather than depth and to get a general feel for the size of the topic area. A graduate student might do an exploratory review of the literature before beginning a synoptic, or more comprehensive one.

Examples of an Exploratory Review:

• Education : University research management: An exploratory literature review. ( Schuetzenmeister, 2010 ).
• Education : An exploratory review of design principles in constructivist gaming learning environments. ( Rosario & Widmeyer, 2009 ).

1.3.1.4 Focused

A type of literature review limited to a single aspect of previous research, such as methodology. A focused literature review generally will describe the implications of choosing a particular element of past research, such as methodology in terms of data collection, analysis and interpretation.

Examples of a Focused Review:

• Nursing : Clinical inertia in the management of type 2 diabetes mellitus: A focused literature review. ( Khunti, Davies, & Khunti, 2015 ).
• Education : Language awareness: Genre awareness-a focused review of the literature. ( Stainton, 1992 ).

1.3.1.5 Integrative

Critiques past research and draws overall conclusions from the body of literature at a specified point in time. Reviews, critiques, and synthesizes representative literature on a topic in an integrated way. Most integrative reviews are intended to address mature topics or  emerging topics. May require the author to adopt a guiding theory, a set of competing models, or a point of view about a topic.  For more description of integrative reviews, see Whittemore & Knafl (2005).

Examples of an Integrative Review:

• Nursing : Interprofessional teamwork and collaboration between community health workers and healthcare teams: An integrative review. ( Franklin,  Bernhardt, Lopez, Long-Middleton, & Davis, 2015 ).
• Education : Exploring the gap between teacher certification and permanent employment in Ontario: An integrative literature review. ( Brock & Ryan, 2016 ).

1.3.1.6 Meta-analysis

A subset of a  systematic review, that takes findings from several studies on the same subject and analyzes them using standardized statistical procedures to pool together data. Integrates findings from a large body of quantitative findings to enhance understanding, draw conclusions, and detect patterns and relationships. Gather data from many different, independent studies that look at the same research question and assess similar outcome measures. Data is combined and re-analyzed, providing a greater statistical power than any single study alone. It’s important to note that not every systematic review includes a meta-analysis but a meta-analysis can’t exist without a systematic review of the literature.

Examples of a Meta-Analysis:

• Education : Efficacy of the cooperative learning method on mathematics achievement and attitude: A meta-analysis research. ( Capar & Tarim, 2015 ).
• Nursing : A meta-analysis of the effects of non-traditional teaching methods on the critical thinking abilities of nursing students. ( Lee, Lee, Gong, Bae, & Choi, 2016 ).
• Education : Gender differences in student attitudes toward science: A meta-analysis of the literature from 1970 to 1991. ( Weinburgh, 1995 ).

1.3.1.7 Narrative/Traditional

An overview of research on a particular topic that critiques and summarizes a body of literature. Typically broad in focus. Relevant past research is selected and synthesized into a coherent discussion. Methodologies, findings and limits of the existing body of knowledge are discussed in narrative form. Sometimes also referred to as a traditional literature review. Requires a sufficiently focused research question. The process may be subject to bias that supports the researcher’s own work.

Examples of a Narrative/Traditional Review:

• Nursing : Family carers providing support to a person dying in the home setting: A narrative literature review. ( Morris, King, Turner, & Payne, 2015 ).
• Education : Adventure education and Outward Bound: Out-of-class experiences that make a lasting difference. ( Hattie, Marsh, Neill, & Richards, 1997 ).
• Education : Good quality discussion is necessary but not sufficient in asynchronous tuition: A brief narrative review of the literature. ( Fear & Erikson-Brown, 2014 ).
• Nursing : Outcomes of physician job satisfaction: A narrative review, implications, and directions for future research. ( Williams & Skinner, 2003 ).

1.3.1.8 Realist

Aspecific type of literature review that is theory-driven and interpretative and is intended to explain the outcomes of a complex intervention program(s).

Examples of a Realist Review:

• Nursing : Lean thinking in healthcare: A realist review of the literature. ( Mazzacato, Savage, Brommels, 2010 ).
• Education : Unravelling quality culture in higher education: A realist review. ( Bendermacher, Egbrink, Wolfhagen, & Dolmans, 2017 ).

1.3.1.9 Scoping

Tend to be non-systematic and focus on breadth of coverage conducted on a topic rather than depth. Utilize a wide range of materials; may not evaluate the quality of the studies as much as count the number. One means of understanding existing literature. Aims to identify nature and extent of research; preliminary assessment of size and scope of available research on topic. May include research in progress.

Examples of a Scoping Review:

• Nursing : Organizational interventions improving access to community-based primary health care for vulnerable populations: A scoping review. ( Khanassov, Pluye, Descoteaux, Haggerty,  Russell, Gunn, & Levesque, 2016 ).
• Education : Interdisciplinary doctoral research supervision: A scoping review. ( Vanstone, Hibbert, Kinsella, McKenzie, Pitman, & Lingard, 2013 ).
• Nursing : A scoping review of the literature on the abolition of user fees in health care services in Africa. ( Ridde, & Morestin, 2011 ).

1.3.1.10 Synoptic

Unlike an exploratory review, the purpose is to provide a concise but accurate overview of all material that appears to be relevant to a chosen topic. Both content and methodological material is included. The review should aim to be both descriptive and evaluative. Summarizes previous studies while also showing how the body of literature could be extended and improved in terms of content and method by identifying gaps.

Examples of a Synoptic Review:

• Education : Theoretical framework for educational assessment: A synoptic review. ( Ghaicha, 2016 ).
• Education : School effects research: A synoptic review of past efforts and some suggestions for the future. ( Cuttance, 1981 ).

1.3.1.11 Systematic Review

A rigorous review that follows a strict methodology designed with a presupposed selection of literature reviewed.  Undertaken to clarify the state of existing research, the evidence, and possible implications that can be drawn from that.  Using comprehensive and exhaustive searching of the published and unpublished literature, searching various databases, reports, and grey literature.  Transparent and reproducible in reporting details of time frame, search and methods to minimize bias.  Must include a team of at least 2-3 and includes the critical appraisal of the literature.  For more description of systematic reviews, including links to protocols, checklists, workflow processes, and structure see “ A Young Researcher’s Guide to a Systematic Review “.

Examples of a Systematic Review:

• Education : The potentials of using cloud computing in schools: A systematic literature review ( Hartmann, Braae, Pedersen, & Khalid, 2017 )
• Nursing : Is butter back? A systematic review and meta-analysis of butter consumption and risk of cardiovascular disease, diabetes, and total mortality. ( Pimpin, Wu, Haskelberg, Del Gobbo, & Mozaffarian, 2016 ).
• Education : The use of research to improve professional practice: a systematic review of the literature. ( Hemsley-Brown & Sharp, 2003 ).
• Nursing : Using computers to self-manage type 2 diabetes. ( Pal, Eastwood, Michie, Farmer, Barnard, Peacock, Wood, Inniss, & Murray, 2013 ).

1.3.1.12 Umbrella/Overview of Reviews

Compiles evidence from multiple systematic reviews into one document. Focuses on broad condition or problem for which there are competing interventions and highlights reviews that address those interventions and their effects. Often used in recommendations for practice.

Examples of an Umbrella/Overview Review:

• Education : Reflective practice in healthcare education: An umbrella review. ( Fragknos, 2016 ).
• Nursing : Systematic reviews of psychosocial interventions for autism: an umbrella review. ( Seida, Ospina, Karkhaneh, Hartling, Smith, & Clark, 2009 ).

For a brief discussion see “ Not all literature reviews are the same ” (Thomson, 2013).

1.4 Why do a Literature Review?

The purpose of the literature review is the same regardless of the topic or research method. It tests your own research question against what is already known about the subject.

1.4.1 First – It’s part of the whole. Omission of a literature review chapter or section in a graduate-level project represents a serious void or absence of critical element in the research process.

The outcome of your review is expected to demonstrate that you:

• can systematically explore the research in your topic area
• can read and critically analyze the literature in your discipline and then use it appropriately to advance your own work
• have sufficient knowledge in the topic to undertake further investigation

1.4.2 Second – It’s good for you!

• You improve your skills as a researcher
• You become familiar with the discourse of your discipline and learn how to be a scholar in your field
• You learn through writing your ideas and finding your voice in your subject area
• You define, redefine and clarify your research question for yourself in the process

1.4.3 Third – It’s good for your reader. Your reader expects you to have done the hard work of gathering, evaluating and synthesizes the literature.  When you do a literature review you:

• Set the context for the topic and present its significance
• Identify what’s important to know about your topic – including individual material, prior research, publications, organizations and authors.
• Demonstrate relationships among prior research
• Establish limitations of existing knowledge
• Analyze trends in the topic’s treatment and gaps in the literature

1.4.4 Why do a literature review?

• To locate gaps in the literature of your discipline
• To avoid reinventing the wheel
• To carry on where others have already been
• To identify other people working in the same field
• To increase your breadth of knowledge in your subject area
• To find the seminal works in your field
• To provide intellectual context for your own work
• To acknowledge opposing viewpoints
• To put your work in perspective
• To demonstrate you can discover and retrieve previous work in the area

1.5 Common Literature Review Errors

Graduate-level literature reviews are more than a summary of the publications you find on a topic.  As you have seen in this brief introduction, literature reviews are a very specific type of research, analysis, and writing.  We will explore these topics more in the next chapters.  Some things to keep in mind as you begin your own research and writing are ways to avoid the most common errors seen in the first attempt at a literature review.  For a quick review of some of the pitfalls and challenges a new researcher faces when he/she begins work, see “ Get Ready: Academic Writing, General Pitfalls and (oh yes) Getting Started! ”.

As you begin your own graduate-level literature review, try to avoid these common mistakes:

• Accepts another researcher’s finding as valid without evaluating methodology and data
• Contrary findings and alternative interpretations are not considered or mentioned
• Findings are not clearly related to one’s own study, or findings are too general
• Insufficient time allowed to define best search strategies and writing
• Isolated statistical results are simply reported rather than synthesizing the results
• Problems with selecting and using most relevant keywords, subject headings and descriptors
• Relies too heavily on secondary sources
• Search methods are not recorded or reported for transparency
• Summarizes rather than synthesizes articles

In conclusion, the purpose of a literature review is three-fold:

• to survey the current state of knowledge or evidence in the area of inquiry,
• to identify key authors, articles, theories, and findings in that area, and
• to identify gaps in knowledge in that research area.

A literature review is commonly done today using computerized keyword searches in online databases, often working with a trained librarian or information expert. Keywords can be combined using the Boolean operators, “and”, “or” and sometimes “not”  to narrow down or expand the search results. Once a list of articles is generated from the keyword and subject heading search, the researcher must then manually browse through each title and abstract, to determine the suitability of that article before a full-text article is obtained for the research question.

Literature reviews should be reasonably complete, and not restricted to a few journals, a few years, or a specific methodology or research design. Reviewed articles may be summarized in the form of tables, and can be further structured using organizing frameworks such as a concept matrix.

A well-conducted literature review should indicate whether the initial research questions have already been addressed in the literature, whether there are newer or more interesting research questions available, and whether the original research questions should be modified or changed in light of findings of the literature review.

The review can also provide some intuitions or potential answers to the questions of interest and/or help identify theories that have previously been used to address similar questions and may provide evidence to inform policy or decision-making. ( Bhattacherjee, 2012 ).

Read Abstract 1.  Refer to Types of Literature Reviews.  What type of literature review do you think this study is and why?  See the Answer Key for the correct response.

Nursing : To describe evidence of international literature on the safe care of the hospitalised child after the World Alliance for Patient Safety and list contributions of the general theoretical framework of patient safety for paediatric nursing.

An integrative literature review between 2004 and 2015 using the databases PubMed, Cumulative Index of Nursing and Allied Health Literature (CINAHL), Scopus, Web of Science and Wiley Online Library, and the descriptors Safety or Patient safety, Hospitalised child, Paediatric nursing, and Nursing care.

Thirty-two articles were analysed, most of which were from North American, with a descriptive approach. The quality of the recorded information in the medical records, the use of checklists, and the training of health workers contribute to safe care in paediatric nursing and improve the medication process and partnerships with parents.

General information available on patient safety should be incorporated in paediatric nursing care. ( Wegner, Silva, Peres, Bandeira, Frantz, Botene, & Predebon, 2017 ).

Read Abstract 2.  Refer to Types of Literature Reviews.  What type of lit review do you think this study is and why?  See the Answer Key for the correct response.

Education : The focus of this paper centers around timing associated with early childhood education programs and interventions using meta-analytic methods. At any given assessment age, a child’s current age equals starting age, plus duration of program, plus years since program ended. Variability in assessment ages across the studies should enable everyone to identify the separate effects of all three time-related components. The project is a meta-analysis of evaluation studies of early childhood education programs conducted in the United States and its territories between 1960 and 2007. The population of interest is children enrolled in early childhood education programs between the ages of 0 and 5 and their control-group counterparts. Since the data come from a meta-analysis, the population for this study is drawn from many different studies with diverse samples. Given the preliminary nature of their analysis, the authors cannot offer conclusions at this point. ( Duncan, Leak, Li, Magnuson, Schindler, & Yoshikawa, 2011 ).

Test Yourself

See Answer Key for the correct responses.

The purpose of a graduate-level literature review is to summarize in as many words as possible everything that is known about my topic.

A literature review is significant because in the process of doing one, the researcher learns to read and critically assess the literature of a discipline and then uses it appropriately to advance his/her own research.

Read the following abstract and choose the correct type of literature review it represents.

Nursing: E-cigarette use has become increasingly popular, especially among the young. Its long-term influence upon health is unknown. Aim of this review has been to present the current state of knowledge about the impact of e-cigarette use on health, with an emphasis on Central and Eastern Europe. During the preparation of this narrative review, the literature on e-cigarettes available within the network PubMed was retrieved and examined. In the final review, 64 research papers were included. We specifically assessed the construction and operation of the e-cigarette as well as the chemical composition of the e-liquid; the impact that vapor arising from the use of e-cigarette explored in experimental models in vitro; and short-term effects of use of e-cigarettes on users’ health. Among the substances inhaled by the e-smoker, there are several harmful products, such as: formaldehyde, acetaldehyde, acroleine, propanal, nicotine, acetone, o-methyl-benzaldehyde, carcinogenic nitrosamines. Results from experimental animal studies indicate the negative impact of e-cigarette exposure on test models, such as ascytotoxicity, oxidative stress, inflammation, airway hyper reactivity, airway remodeling, mucin production, apoptosis, and emphysematous changes. The short-term impact of e-cigarettes on human health has been studied mostly in experimental setting. Available evidence shows that the use of e-cigarettes may result in acute lung function responses (e.g., increase in impedance, peripheral airway flow resistance) and induce oxidative stress. Based on the current available evidence, e-cigarette use is associated with harmful biologic responses, although it may be less harmful than traditional cigarettes. (J ankowski, Brożek, Lawson, Skoczyński, & Zejda, 2017 ).

• Meta-analysis
• Exploratory

Education: In this review, Mary Vorsino writes that she is interested in keeping the potential influences of women pragmatists of Dewey’s day in mind while presenting modern feminist re readings of Dewey. She wishes to construct a narrowly-focused and succinct literature review of thinkers who have donned a feminist lens to analyze Dewey’s approaches to education, learning, and democracy and to employ Dewey’s works in theorizing on gender and education and on gender in society. This article first explores Dewey as both an ally and a problematic figure in feminist literature and then investigates the broader sphere of feminist pragmatism and two central themes within it: (1) valuing diversity, and diverse experiences; and (2) problematizing fixed truths. ( Vorsino, 2015 ).

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• How to Write a Literature Review | Guide, Examples, & Templates

How to Write a Literature Review | Guide, Examples, & Templates

Published on January 2, 2023 by Shona McCombes . Revised on September 11, 2023.

What is a literature review? A literature review is a survey of scholarly sources on a specific topic. It provides an overview of current knowledge, allowing you to identify relevant theories, methods, and gaps in the existing research that you can later apply to your paper, thesis, or dissertation topic .

There are five key steps to writing a literature review:

• Search for relevant literature
• Evaluate sources
• Identify themes, debates, and gaps
• Outline the structure
• Write your literature review

A good literature review doesn’t just summarize sources—it analyzes, synthesizes , and critically evaluates to give a clear picture of the state of knowledge on the subject.

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Table of contents

What is the purpose of a literature review, examples of literature reviews, step 1 – search for relevant literature, step 2 – evaluate and select sources, step 3 – identify themes, debates, and gaps, step 4 – outline your literature review’s structure, step 5 – write your literature review, free lecture slides, other interesting articles, frequently asked questions, introduction.

• Quick Run-through
• Step 1 & 2

When you write a thesis , dissertation , or research paper , you will likely have to conduct a literature review to situate your research within existing knowledge. The literature review gives you a chance to:

• Demonstrate your familiarity with the topic and its scholarly context
• Develop a theoretical framework and methodology for your research
• Position your work in relation to other researchers and theorists
• Show how your research addresses a gap or contributes to a debate
• Evaluate the current state of research and demonstrate your knowledge of the scholarly debates around your topic.

Writing literature reviews is a particularly important skill if you want to apply for graduate school or pursue a career in research. We’ve written a step-by-step guide that you can follow below.

Prevent plagiarism. Run a free check.

Writing literature reviews can be quite challenging! A good starting point could be to look at some examples, depending on what kind of literature review you’d like to write.

• Example literature review #1: “Why Do People Migrate? A Review of the Theoretical Literature” ( Theoretical literature review about the development of economic migration theory from the 1950s to today.)
• Example literature review #2: “Literature review as a research methodology: An overview and guidelines” ( Methodological literature review about interdisciplinary knowledge acquisition and production.)
• Example literature review #3: “The Use of Technology in English Language Learning: A Literature Review” ( Thematic literature review about the effects of technology on language acquisition.)
• Example literature review #4: “Learners’ Listening Comprehension Difficulties in English Language Learning: A Literature Review” ( Chronological literature review about how the concept of listening skills has changed over time.)

You can also check out our templates with literature review examples and sample outlines at the links below.

Download Word doc Download Google doc

Before you begin searching for literature, you need a clearly defined topic .

If you are writing the literature review section of a dissertation or research paper, you will search for literature related to your research problem and questions .

Make a list of keywords

Start by creating a list of keywords related to your research question. Include each of the key concepts or variables you’re interested in, and list any synonyms and related terms. You can add to this list as you discover new keywords in the process of your literature search.

• Social media, Facebook, Instagram, Twitter, Snapchat, TikTok
• Body image, self-perception, self-esteem, mental health
• Generation Z, teenagers, adolescents, youth

Search for relevant sources

Use your keywords to begin searching for sources. Some useful databases to search for journals and articles include:

• Your university’s library catalogue
• Google Scholar
• Project Muse (humanities and social sciences)
• Medline (life sciences and biomedicine)
• EconLit (economics)
• Inspec (physics, engineering and computer science)

You can also use boolean operators to help narrow down your search.

Make sure to read the abstract to find out whether an article is relevant to your question. When you find a useful book or article, you can check the bibliography to find other relevant sources.

You likely won’t be able to read absolutely everything that has been written on your topic, so it will be necessary to evaluate which sources are most relevant to your research question.

For each publication, ask yourself:

• What question or problem is the author addressing?
• What are the key concepts and how are they defined?
• What are the key theories, models, and methods?
• Does the research use established frameworks or take an innovative approach?
• What are the results and conclusions of the study?
• How does the publication relate to other literature in the field? Does it confirm, add to, or challenge established knowledge?
• What are the strengths and weaknesses of the research?

Make sure the sources you use are credible , and make sure you read any landmark studies and major theories in your field of research.

You can use our template to summarize and evaluate sources you’re thinking about using. Click on either button below to download.

Take notes and cite your sources

As you read, you should also begin the writing process. Take notes that you can later incorporate into the text of your literature review.

It is important to keep track of your sources with citations to avoid plagiarism . It can be helpful to make an annotated bibliography , where you compile full citation information and write a paragraph of summary and analysis for each source. This helps you remember what you read and saves time later in the process.

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To begin organizing your literature review’s argument and structure, be sure you understand the connections and relationships between the sources you’ve read. Based on your reading and notes, you can look for:

• Trends and patterns (in theory, method or results): do certain approaches become more or less popular over time?
• Themes: what questions or concepts recur across the literature?
• Debates, conflicts and contradictions: where do sources disagree?
• Pivotal publications: are there any influential theories or studies that changed the direction of the field?
• Gaps: what is missing from the literature? Are there weaknesses that need to be addressed?

This step will help you work out the structure of your literature review and (if applicable) show how your own research will contribute to existing knowledge.

• Most research has focused on young women.
• There is an increasing interest in the visual aspects of social media.
• But there is still a lack of robust research on highly visual platforms like Instagram and Snapchat—this is a gap that you could address in your own research.

There are various approaches to organizing the body of a literature review. Depending on the length of your literature review, you can combine several of these strategies (for example, your overall structure might be thematic, but each theme is discussed chronologically).

Chronological

The simplest approach is to trace the development of the topic over time. However, if you choose this strategy, be careful to avoid simply listing and summarizing sources in order.

Try to analyze patterns, turning points and key debates that have shaped the direction of the field. Give your interpretation of how and why certain developments occurred.

If you have found some recurring central themes, you can organize your literature review into subsections that address different aspects of the topic.

For example, if you are reviewing literature about inequalities in migrant health outcomes, key themes might include healthcare policy, language barriers, cultural attitudes, legal status, and economic access.

Methodological

If you draw your sources from different disciplines or fields that use a variety of research methods , you might want to compare the results and conclusions that emerge from different approaches. For example:

• Look at what results have emerged in qualitative versus quantitative research
• Discuss how the topic has been approached by empirical versus theoretical scholarship
• Divide the literature into sociological, historical, and cultural sources

Theoretical

A literature review is often the foundation for a theoretical framework . You can use it to discuss various theories, models, and definitions of key concepts.

You might argue for the relevance of a specific theoretical approach, or combine various theoretical concepts to create a framework for your research.

Like any other academic text , your literature review should have an introduction , a main body, and a conclusion . What you include in each depends on the objective of your literature review.

The introduction should clearly establish the focus and purpose of the literature review.

Depending on the length of your literature review, you might want to divide the body into subsections. You can use a subheading for each theme, time period, or methodological approach.

As you write, you can follow these tips:

• Summarize and synthesize: give an overview of the main points of each source and combine them into a coherent whole
• Analyze and interpret: don’t just paraphrase other researchers — add your own interpretations where possible, discussing the significance of findings in relation to the literature as a whole
• Critically evaluate: mention the strengths and weaknesses of your sources
• Write in well-structured paragraphs: use transition words and topic sentences to draw connections, comparisons and contrasts

In the conclusion, you should summarize the key findings you have taken from the literature and emphasize their significance.

When you’ve finished writing and revising your literature review, don’t forget to proofread thoroughly before submitting. Not a language expert? Check out Scribbr’s professional proofreading services !

This article has been adapted into lecture slides that you can use to teach your students about writing a literature review.

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If you want to know more about the research process , methodology , research bias , or statistics , make sure to check out some of our other articles with explanations and examples.

• Sampling methods
• Simple random sampling
• Stratified sampling
• Cluster sampling
• Likert scales
• Reproducibility

 Statistics

• Null hypothesis
• Statistical power
• Probability distribution
• Effect size
• Poisson distribution

Research bias

• Optimism bias
• Cognitive bias
• Implicit bias
• Hawthorne effect
• Anchoring bias
• Explicit bias

A literature review is a survey of scholarly sources (such as books, journal articles, and theses) related to a specific topic or research question .

It is often written as part of a thesis, dissertation , or research paper , in order to situate your work in relation to existing knowledge.

There are several reasons to conduct a literature review at the beginning of a research project:

• To familiarize yourself with the current state of knowledge on your topic
• To ensure that you’re not just repeating what others have already done
• To identify gaps in knowledge and unresolved problems that your research can address
• To develop your theoretical framework and methodology
• To provide an overview of the key findings and debates on the topic

Writing the literature review shows your reader how your work relates to existing research and what new insights it will contribute.

The literature review usually comes near the beginning of your thesis or dissertation . After the introduction , it grounds your research in a scholarly field and leads directly to your theoretical framework or methodology .

A literature review is a survey of credible sources on a topic, often used in dissertations , theses, and research papers . Literature reviews give an overview of knowledge on a subject, helping you identify relevant theories and methods, as well as gaps in existing research. Literature reviews are set up similarly to other  academic texts , with an introduction , a main body, and a conclusion .

An  annotated bibliography is a list of  source references that has a short description (called an annotation ) for each of the sources. It is often assigned as part of the research process for a  paper .  

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Literature Review Basics

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Literature Review Tutorials

• Literature Reviews: An Overview for Students What is a literature review? What purpose does it serve in research? What should you expect when writing one? Find out here in this guide from NCSU libraries.
• Write a Lit Review from Virginia Commonwealth University Follow this guide to learn how to write a literature review, beginning with a synthesis matrix.
• Literature Review: The What, Why and How-to Guide This guide will help you understand what is a Literature Review, why it is important and how it is done. Also includes information on Annotated Bibliographies.
• Writing a Literature Review from the University of Toledo Covers what a lit review is, lit review types, writing a lit review and further readings.
• The Literature Review Process A guide from the University of North Texas on selecting a topic, searching the literature, plan before reviewing, reviewing the literature and writing the review.
• The Writing Center, University of North Carolina at Chapel Hill Permission granted to use this guide.

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In This Article Expand or collapse the "in this article" section Literature Reviews

Introduction, what is a literature review.

• Literature Reviews for Thesis or Dissertation
• Stand-alone and Systemic Reviews
• Purposes of a Literature Review
• Texts on Conducting a Literature Review
• Identifying the Research Topic
• The Persuasive Argument
• Searching the Literature
• Creating a Synthesis
• Critiquing the Literature
• Building the Case for the Literature Review Document
• Presenting the Literature Review

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Literature Reviews by Lawrence A. Machi , Brenda T. McEvoy LAST REVIEWED: 27 October 2016 LAST MODIFIED: 27 October 2016 DOI: 10.1093/obo/9780199756810-0169

Literature reviews play a foundational role in the development and execution of a research project. They provide access to the academic conversation surrounding the topic of the proposed study. By engaging in this scholarly exercise, the researcher is able to learn and to share knowledge about the topic. The literature review acts as the springboard for new research, in that it lays out a logically argued case, founded on a comprehensive understanding of the current state of knowledge about the topic. The case produced provides the justification for the research question or problem of a proposed study, and the methodological scheme best suited to conduct the research. It can also be a research project in itself, arguing policy or practice implementation, based on a comprehensive analysis of the research in a field. The term literature review can refer to the output or the product of a review. It can also refer to the process of Conducting a Literature Review . Novice researchers, when attempting their first research projects, tend to ask two questions: What is a Literature Review? How do you do one? While this annotated bibliography is neither definitive nor exhaustive in its treatment of the subject, it is designed to provide a beginning researcher, who is pursuing an academic degree, an entry point for answering the two previous questions. The article is divided into two parts. The first four sections of the article provide a general overview of the topic. They address definitions, types, purposes, and processes for doing a literature review. The second part presents the process and procedures for doing a literature review. Arranged in a sequential fashion, the remaining eight sections provide references addressing each step of the literature review process. References included in this article were selected based on their ability to assist the beginning researcher. Additionally, the authors attempted to include texts from various disciplines in social science to present various points of view on the subject.

Novice researchers often have a misguided perception of how to do a literature review and what the document should contain. Literature reviews are not narrative annotated bibliographies nor book reports (see Bruce 1994 ). Their form, function, and outcomes vary, due to how they depend on the research question, the standards and criteria of the academic discipline, and the orthodoxies of the research community charged with the research. The term literature review can refer to the process of doing a review as well as the product resulting from conducting a review. The product resulting from reviewing the literature is the concern of this section. Literature reviews for research studies at the master’s and doctoral levels have various definitions. Machi and McEvoy 2016 presents a general definition of a literature review. Lambert 2012 defines a literature review as a critical analysis of what is known about the study topic, the themes related to it, and the various perspectives expressed regarding the topic. Fink 2010 defines a literature review as a systematic review of existing body of data that identifies, evaluates, and synthesizes for explicit presentation. Jesson, et al. 2011 defines the literature review as a critical description and appraisal of a topic. Hart 1998 sees the literature review as producing two products: the presentation of information, ideas, data, and evidence to express viewpoints on the nature of the topic, as well as how it is to be investigated. When considering literature reviews beyond the novice level, Ridley 2012 defines and differentiates the systematic review from literature reviews associated with primary research conducted in academic degree programs of study, including stand-alone literature reviews. Cooper 1998 states the product of literature review is dependent on the research study’s goal and focus, and defines synthesis reviews as literature reviews that seek to summarize and draw conclusions from past empirical research to determine what issues have yet to be resolved. Theoretical reviews compare and contrast the predictive ability of theories that explain the phenomenon, arguing which theory holds the most validity in describing the nature of that phenomenon. Grant and Booth 2009 identified fourteen types of reviews used in both degree granting and advanced research projects, describing their attributes and methodologies.

Bruce, Christine Susan. 1994. Research students’ early experiences of the dissertation literature review. Studies in Higher Education 19.2: 217–229.

DOI: 10.1080/03075079412331382057

A phenomenological analysis was conducted with forty-one neophyte research scholars. The responses to the questions, “What do you mean when you use the words literature review?” and “What is the meaning of a literature review for your research?” identified six concepts. The results conclude that doing a literature review is a problem area for students.

Cooper, Harris. 1998. Synthesizing research . Vol. 2. 3d ed. Thousand Oaks, CA: SAGE.

The introductory chapter of this text provides a cogent explanation of Cooper’s understanding of literature reviews. Chapter 4 presents a comprehensive discussion of the synthesis review. Chapter 5 discusses meta-analysis and depth.

Fink, Arlene. 2010. Conducting research literature reviews: From the Internet to paper . 3d ed. Los Angeles: SAGE.

The first chapter of this text (pp. 1–16) provides a short but clear discussion of what a literature review is in reference to its application to a broad range of social sciences disciplines and their related professions.

Grant, Maria J., and Andrew Booth. 2009. A typology of reviews: An analysis of 14 review types and associated methodologies. Health Information & Libraries Journal 26.2: 91–108. Print.

DOI: 10.1111/j.1471-1842.2009.00848.x

This article reports a scoping review that was conducted using the “Search, Appraisal, Synthesis, and Analysis” (SALSA) framework. Fourteen literature review types and associated methodology make up the resulting typology. Each type is described by its key characteristics and analyzed for its strengths and weaknesses.

Hart, Chris. 1998. Doing a literature review: Releasing the social science research imagination . London: SAGE.

Chapter 1 of this text explains Hart’s definition of a literature review. Additionally, it describes the roles of the literature review, the skills of a literature reviewer, and the research context for a literature review. Of note is Hart’s discussion of the literature review requirements for master’s degree and doctoral degree work.

Jesson, Jill, Lydia Matheson, and Fiona M. Lacey. 2011. Doing your literature review: Traditional and systematic techniques . Los Angeles: SAGE.

Chapter 1: “Preliminaries” provides definitions of traditional and systematic reviews. It discusses the differences between them. Chapter 5 is dedicated to explaining the traditional review, while Chapter 7 explains the systematic review. Chapter 8 provides a detailed description of meta-analysis.

Lambert, Mike. 2012. A beginner’s guide to doing your education research project . Los Angeles: SAGE.

Chapter 6 (pp. 79–100) presents a thumbnail sketch for doing a literature review.

Machi, Lawrence A., and Brenda T. McEvoy. 2016. The literature review: Six steps to success . 3d ed. Thousand Oaks, CA: Corwin.

The introduction of this text differentiates between a simple and an advanced review and concisely defines a literature review.

Ridley, Diana. 2012. The literature review: A step-by-step guide for students . 2d ed. Sage Study Skills. London: SAGE.

In the introductory chapter, Ridley reviews many definitions of the literature review, literature reviews at the master’s and doctoral level, and placement of literature reviews within the thesis or dissertation document. She also defines and differentiates literature reviews produced for degree-affiliated research from the more advanced systematic review projects.

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Education Research Guide: How to Write a Literature Review

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Literature Reviews Explained

Use the articles below to learn about:

• what a literature review is
• how to select and research a topic
• how to write a literature review
• University of North Carolina at Chapel Hill The Writing Center: Literature Reviews
• OWL (Purdue University Online Writing Lab): Using APA to format your Literature Review

Synthesizing Explained

Synthesizing is a method of analyzing the main ideas and important information from your sources as you read and prepare to write a literature review. Review the resources below for sample synthesizing methods. Both examples have tables you can fill out as you read articles to help you organize your thoughts. 

• Writing a Literature Review and Using a Synthesis Matrix: NC University Tutorial Center
• Matrix Example from the University of West Florida Libraries
• Synthesizing Cornelsen This article is included in "Writing a Literature Review and Using a Synthesis Matrix" to illustrate synthesizing articles in the sample matrix.
• Synthesizing: Bruley This article is included in "Writing a Literature Review and Using a Synthesis Matrix" to illustrate synthesizing articles in the sample matrix.

Sample Literature Reviews

Make sure you follow any instructions from you professor on how to format your literature review! Use the examples below to get ideas for how you might write about the sources you found in your research.

• Literature Review 1
• Literature Review 2
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Writing a Literature Review

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A literature review is a document or section of a document that collects key sources on a topic and discusses those sources in conversation with each other (also called synthesis ). The lit review is an important genre in many disciplines, not just literature (i.e., the study of works of literature such as novels and plays). When we say “literature review” or refer to “the literature,” we are talking about the research ( scholarship ) in a given field. You will often see the terms “the research,” “the scholarship,” and “the literature” used mostly interchangeably.

Where, when, and why would I write a lit review?

There are a number of different situations where you might write a literature review, each with slightly different expectations; different disciplines, too, have field-specific expectations for what a literature review is and does. For instance, in the humanities, authors might include more overt argumentation and interpretation of source material in their literature reviews, whereas in the sciences, authors are more likely to report study designs and results in their literature reviews; these differences reflect these disciplines’ purposes and conventions in scholarship. You should always look at examples from your own discipline and talk to professors or mentors in your field to be sure you understand your discipline’s conventions, for literature reviews as well as for any other genre.

A literature review can be a part of a research paper or scholarly article, usually falling after the introduction and before the research methods sections. In these cases, the lit review just needs to cover scholarship that is important to the issue you are writing about; sometimes it will also cover key sources that informed your research methodology.

Lit reviews can also be standalone pieces, either as assignments in a class or as publications. In a class, a lit review may be assigned to help students familiarize themselves with a topic and with scholarship in their field, get an idea of the other researchers working on the topic they’re interested in, find gaps in existing research in order to propose new projects, and/or develop a theoretical framework and methodology for later research. As a publication, a lit review usually is meant to help make other scholars’ lives easier by collecting and summarizing, synthesizing, and analyzing existing research on a topic. This can be especially helpful for students or scholars getting into a new research area, or for directing an entire community of scholars toward questions that have not yet been answered.

What are the parts of a lit review?

Most lit reviews use a basic introduction-body-conclusion structure; if your lit review is part of a larger paper, the introduction and conclusion pieces may be just a few sentences while you focus most of your attention on the body. If your lit review is a standalone piece, the introduction and conclusion take up more space and give you a place to discuss your goals, research methods, and conclusions separately from where you discuss the literature itself.

Introduction:

• An introductory paragraph that explains what your working topic and thesis is
• A forecast of key topics or texts that will appear in the review
• Potentially, a description of how you found sources and how you analyzed them for inclusion and discussion in the review (more often found in published, standalone literature reviews than in lit review sections in an article or research paper)
• Summarize and synthesize: Give an overview of the main points of each source and combine them into a coherent whole
• Analyze and interpret: Don’t just paraphrase other researchers – add your own interpretations where possible, discussing the significance of findings in relation to the literature as a whole
• Critically Evaluate: Mention the strengths and weaknesses of your sources
• Write in well-structured paragraphs: Use transition words and topic sentence to draw connections, comparisons, and contrasts.

Conclusion:

• Summarize the key findings you have taken from the literature and emphasize their significance
• Connect it back to your primary research question

How should I organize my lit review?

Lit reviews can take many different organizational patterns depending on what you are trying to accomplish with the review. Here are some examples:

• Chronological : The simplest approach is to trace the development of the topic over time, which helps familiarize the audience with the topic (for instance if you are introducing something that is not commonly known in your field). If you choose this strategy, be careful to avoid simply listing and summarizing sources in order. Try to analyze the patterns, turning points, and key debates that have shaped the direction of the field. Give your interpretation of how and why certain developments occurred (as mentioned previously, this may not be appropriate in your discipline — check with a teacher or mentor if you’re unsure).
• Thematic : If you have found some recurring central themes that you will continue working with throughout your piece, you can organize your literature review into subsections that address different aspects of the topic. For example, if you are reviewing literature about women and religion, key themes can include the role of women in churches and the religious attitude towards women.
• Qualitative versus quantitative research
• Empirical versus theoretical scholarship
• Divide the research by sociological, historical, or cultural sources
• Theoretical : In many humanities articles, the literature review is the foundation for the theoretical framework. You can use it to discuss various theories, models, and definitions of key concepts. You can argue for the relevance of a specific theoretical approach or combine various theorical concepts to create a framework for your research.

What are some strategies or tips I can use while writing my lit review?

Any lit review is only as good as the research it discusses; make sure your sources are well-chosen and your research is thorough. Don’t be afraid to do more research if you discover a new thread as you’re writing. More info on the research process is available in our "Conducting Research" resources .

As you’re doing your research, create an annotated bibliography ( see our page on the this type of document ). Much of the information used in an annotated bibliography can be used also in a literature review, so you’ll be not only partially drafting your lit review as you research, but also developing your sense of the larger conversation going on among scholars, professionals, and any other stakeholders in your topic.

Usually you will need to synthesize research rather than just summarizing it. This means drawing connections between sources to create a picture of the scholarly conversation on a topic over time. Many student writers struggle to synthesize because they feel they don’t have anything to add to the scholars they are citing; here are some strategies to help you:

• It often helps to remember that the point of these kinds of syntheses is to show your readers how you understand your research, to help them read the rest of your paper.
• Writing teachers often say synthesis is like hosting a dinner party: imagine all your sources are together in a room, discussing your topic. What are they saying to each other?
• Look at the in-text citations in each paragraph. Are you citing just one source for each paragraph? This usually indicates summary only. When you have multiple sources cited in a paragraph, you are more likely to be synthesizing them (not always, but often
• Read more about synthesis here.

The most interesting literature reviews are often written as arguments (again, as mentioned at the beginning of the page, this is discipline-specific and doesn’t work for all situations). Often, the literature review is where you can establish your research as filling a particular gap or as relevant in a particular way. You have some chance to do this in your introduction in an article, but the literature review section gives a more extended opportunity to establish the conversation in the way you would like your readers to see it. You can choose the intellectual lineage you would like to be part of and whose definitions matter most to your thinking (mostly humanities-specific, but this goes for sciences as well). In addressing these points, you argue for your place in the conversation, which tends to make the lit review more compelling than a simple reporting of other sources.

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Education: Literature Reviews

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Getting Started on Literature Reviews

• "Reviewing the Literature" Project Planner SAGE Research Methods. Provides checklists and bullet points for the literature review process, with "Search for reources" links to relevant SAGE Research Methods fulltext books and book chapters.
• "Literature reviews" / Lawrence A. Machi & Brenda T. McEvoy Oxford Bibliographies : Education, 2016. An annotated bibliography identifying and describing books and articles on the theory of literature reviews, their variety, and how to write them.

Selected Books on Writing Literature Reviews

Search Databases for Literature Review Articles and Overview Publications

• ERIC (ProQuest) Filter search results for Document Type = 070 : Information Analyses and 130 : Reference Materials - Bibliographies. ERIC Digests, research syntheses produced by ERIC ceased after ERIC's reform that closed its research-monitoring clearinghouses in the early 2000s. The ERIC database continues to make available the 3,000+ ERIC Digest published in 1980-2003. They may be found in ERIC (ProQuest) using the search filter for Document type = 073
• APA PsycInfo PsycINFO has a Methodology limit, with values of Literature review, Systematic Review, or Meta-analysis.
• Web of Science (WOS) Don't be misled by "science" in the title. WOS also covers the humanities and social sciences. On the left, under Refine Results, Select REVIEWS under Document Types. This is a limit for literature reviews or overview articles. THis may not get all lit reviews. Consider also searching the TS field (Title, Abstract, Author Keyword, Keywords Plus®) with meta-analysis, metaanalysis, synthesis, overview.
• Scopus Do a search in Scopus for a keyword. Then refine the results by selected under "Document type" - review.
• PubMed Perform a search, then under Article Type on the right, see Reviews or Systematic Reviews.
• ProQuest Dissertations & Theses Global‎: Full Collection Dissertations can sometimes be useful for review-type surveys of the literature on a specific field. Most often authors begin their study with a review of the literature in order to offer context for their contribution.

Selected Journals with Review Articles

• Review of Educational Research (RER) SAGE, for American Educational Research Association (AERA), 1931- . Publishes critical, integrative reviews of research literature bearing on education, including conceptualizations, interpretations, and syntheses of literature and scholarly work in a field broadly relevant to education and educational research.
• Review of Research in Education (RRE) SAGE, for AERA, 1973- . Each RRE annual volume is devoted to a single topic, with research syntheses and literature reviews.
• Educational Research Review Elsevier, for European Association for Research on Learning and Instruction (EARLI), 2006- .
• Campbell Systematic Reviews Wiley, for Campbell Collaboration, 2004- . CSR publishes finalized systematic reviews developed through the Campbell Collaboration. Subjects include education and child welfare.
• Educational Psychology Review An international forum for the publication of peer-reviewed integrative review articles, special thematic issues, reflections or comments on previous research or new research directions, interviews, and research-based advice for practitioners - all pertaining to the field of educational psychology.
• Annual Reviews AnnRev publishes literature-review journals in physical, life and social sciences. Includes anthropology, economics, linguistics, public health, psychology, and sociology. Education topics may be found in many of these discipline-specific journals.
• Annals of the American Academy of Political and Social Science SAGE, for AAPSS, 1890- . Penn's house journal for the social sciences, and one of the oldest US scholarly journals. Each issue presents research syntheses on a specific topic, with one issue per year focusing on education or child welfare.
• Emerging Trends in the Social and Behavioral sciences Wiley, 2015-201?. Review articles on new research fronts. Includes a recurring section on "Educational Institutions" .

Systematic Review Databases

• Systematic Review Data Repository (SRDR) U.S. Department of Health and Human Services - open and searchable archive of systematic reviews and their data.
• Campbell Collaboration - Library of Systematic Reviews Systematic reviews in areas such as education, criminal justice, social policy and social care. (The Campbell Collaboration was formally established at a meeting at the University of Pennsylvania on 24-25 February 2000.)
• EPPI-Centre The Evidence for Policy and Practice Information and Co-ordinating Centre (EPPI-Centre) is part of the Social Science Research Unit at the Institute of Education, University of London. EPPI develops systematic reviews and developing review methods in social science and public policy.
• Cochrane Collaboration Cochrane Reviews are systematic reviews of primary research in human health care and health policy. Since 2011, Cochrane has an official partnership with the WHO.
• What Works Clearinghouse - U.S. Department of Education
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Education Basics

Literature review overview.

• Article and Media Sources
• Quick Stats and Reference
• OAE and Praxis Core
• Citation & Annotation

There are eight general steps in conducting an education literature review. Please follow the eight numbered boxes, starting below.

Please note that the general framework for this guide is derived from the work of Joyce P. Gall, M.D. Gall, and Walter R. Borg in Applying Educational Research: a Practical Guide (5th ed., 2005). Also, much of the information on framing the research question comes from Emily Grimm's Selected Reference Sources for Graduate Students in Education and Education Related Areas (1995).

Step 1: Frame Your Research Question(s)

Basic Questions

• What do I want to know?  For what purpose? Consider subject terms, synonyms, related concepts and approaches.
• What do I know already?
• Who else might have performed similar research and why? Consider individuals, institutions, governmental agencies and other groups.
• What summarizing or descriptive information is already available? Consider the secondary sources found below.

Time Questions

• For which time span(s) do I need information?
• Would recurrent or temporal events in education affect my research?  For example: school terms, budget hearings, conference proceedings, legislative sessions, policy decisions, elections, administrative procedural changes.

Limitation(s) Questions

• Do I have other limitations?  For example:  language, age group, grade level, type of student, type of school, type of district, geography, curricular area, or style of teaching.

Aspect Questions

• What aspects of education interest me?  For example:  financial, administrative, teaching, legislative, gender, parental, theoretical, research, developmental, practical or other.

Subjective Aspect Questions

• What are my values, prejudices, biases, and areas of ignorance in regard to my research question(s)?
• Will I let these prejudices limit my research?
• Will I let these prejudices influence my note taking, choice of vocabulary and indexing terms, selection of data, evaluations of the work of other researchers, inclusion of conflicting theories, reporting of data, or my conclusions?

Step 2: Contact Experts to Get Answers or for Guidance to Relevant Publications

Consider consulting other educators, faculty or government officials who may specialize in your research area.

You may also want to consult the American Educational Research Association SIG (Special Interest Group) website for the names of groups and individuals who have expertise in different educational areas.  AERA provides the names, addresses, e-mail addresses, and phone numbers of individuals doing research in a variety of areas.

Step 3: Read Secondary Sources to Gain a Broad Overview of the Literature Related to Your Research Area

Use secondary sources to further define your research question and to expand your literature search.  Secondary sources include encyclopedias, handbooks, dictionaries, and thesauri. Secondary sources are resources that review research that others have done.  They provide a general overview, will give you ideas for key search terms, and often include useful bibliographies for further reading.

Here are some key secondary sources and books on doing educational research:

• Review of Educational Research The Review of Educational Research (RER) publishes critical, integrative reviews of research literature bearing on education, including conceptualizations, interpretations, and syntheses of literature and scholarly work in a field broadly relevant to education and educational research.

SAGE Research Methods is a research methods tool created to help researchers¸ faculty and students with their research projects. SAGE Research Methods links over 100¸000 pages of SAGE's book¸ journal and reference content with advanced search and discovery tools. Researchers can explore methods concepts to help them design research projects¸ understand particular methods or identify a new method¸ conduct their research¸ and write up their findings. Since SAGE Research Methods focuses on methodology rather than disciplines¸ it can be used across the social sciences¸ health sciences¸ and more.

• Educational Psychology Review Educational Psychology Review is an international forum for the publication of peer-reviewed integrative review articles, special thematic issues, reflections or comments on previous research or new research directions, interviews, and research-based advice for practitioners.
• Doing educational research : a guide to first-time researchers CECH Prof Ed LB1028 .D65 2004
• Effective action research: developing reflective thinking and practice Electronic (2011)
• Encyclopedia of Education Electronic and Langsam Library Reference, LB 15 .E47 2003
• Encyclopedia of Special Education [electronic resource] : a Reference for the Education of Children, Adolescents, and Adults with Disabilities and other Exceptional Individuals Electronic, 2007.
• Handbook of research on educational communications and technology CECH Library Reference, LB 1028.3 . H355 2008
• Handbook of research on multicultural education CECH Library Reference, LC 1099.3 .H35 2004
• Handbook of research on teaching CECH Library Reference, LB1028 .S39 2001
• How to design and evaluate research in education CECH Reserves LB1028 .F665 2012
• Methods in educational research: from theory to practice Electronic (2010)
• The Phi Delta Kappan [electronic resource] Electronic, Contains many articles that cite research and analyze practical implications.
• The Routledge International Encyclopedia of Education CECH Library Reference, LB 15 .R633 2008

Step 4: Select Preliminary Sources that Index Relevant Research Literature

Preliminary sources index primary research resources such as journal articles, conference proceeding papers, technical reports, government documents, dissertations and more.  The CECH Library has created several specialized library guides on topics such as special education, instructional design & technology, and teaching STEM related topics that list which resources are most helpful for doing research in these areas. See below for key databases in education:

Step 5: Identify Subject Terms, or Descriptors, and Use Them to Search Preliminary Sources

Choosing the most appropriate subject search terms, or descriptors, for searching indexes and catalogs can greatly influence your search results.  A good place to start is ERIC's thesaurus of descriptors:

Step 6: Read and Evaluate Primary Sources Discovered Through Indexes

For assistance in obtaining copies of primary sources, please consult your liaison librarian .

As you print out copies of articles, review copies of books or reports, remember to look in the sources for bibliographies, names of individuals or groups who have done research on the topic, and for additional subject terms to help you narrow or broaden your research.

Step 7: Classify the Publications You Have Reviewed into Meaningful Categories

As you review the sources you find, classify them into meaningful categories.  This will help you prioritize reading them and may indicate useful ways to synthesize what you discover.  You may want to create a simple code for the different categories.

Step 8: Prepare Your Literature Review Report

See the following resources for advice on preparing a literature review report:

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What is a Literature Review?

Basics of a literature review, types of literature reviews.

• Citing Your Information (Attribution)

A Literature Review is a systematic and comprehensive analysis of books, scholarly articles and other sources relevant to a specific topic providing a base of knowledge on a topic. Literature reviews are designed to identify and critique the existing literature on a topic to justify your research by exposing gaps in current research .  This investigation should provide a description, summary, and critical evaluation of works related to the research problem and should also add to the overall knowledge of the topic as well as demonstrating how your research will fit within a larger field of study.  A literature review should offer critical analysis of the current research on a topic and that analysis should direct your research objective. This should not be confused with a book review or an annotated bibliography both research tools but very different in purpose and scope.  A Literature Review can be a stand alone element or part of a larger end product, know your assignment.  Key to a good Literature Review is to document your process. For more information see:

Planning a Literature Review .

There are many different ways to organize your references in a literature review, but most reviews contain certain basic elements.

• Objective of the literature review - Clearly describe the purpose of the paper and state your objectives in completing the literature review.
•   Overview of the subject, issue or theory under consideration – Give an overview of your research topic and what prompted it.
• Categorization of sources – Grouping your research either historic, chronologically or thematically
• Organization of Subtopics – Subtopics should be grouped and presented in a logical order starting with the most prominent or significant and moving to the least significant
• Discussion – Provide analysis of both the uniqueness of each source and its similarities with other source
• Conclusion   - Summary of your analysis and evaluation of the reviewed works and how it is related to its parent discipline, scientific endeavor or profession

As Kennedy (2007) notes*, it is important to think of knowledge in a given field as consisting of three layers. First, there are the primary studies that researchers conduct and publish. Second are the reviews of those studies that summarize and offer new interpretations built from and often extending beyond the original studies. Third, there are the perceptions, conclusions, opinion, and interpretations that are shared informally that become part of the lore of field. In composing a literature review, it is important to note that it is often this third layer of knowledge that is cited as "true" even though it often has only a loose relationship to the primary studies and secondary literature reviews.

Given this, while literature reviews are designed to provide an overview and synthesis of pertinent sources you have explored, there are several approaches to how they can be done, depending upon the type of analysis underpinning your study. Listed below are definitions of types of literature reviews:

Argumentative Review      This form examines literature selectively in order to support or refute an argument, deeply imbedded assumption, or philosophical problem already established in the literature. The purpose is to develop a body of literature that establishes a contrarian viewpoint. Given the value-laden nature of some social science research [e.g., educational reform; immigration control], argumentative approaches to analyzing the literature can be a legitimate and important form of discourse. However, note that they can also introduce problems of bias when they are used to to make summary claims of the sort found in systematic reviews.

Integrative Review      Considered a form of research that reviews, critiques, and synthesizes representative literature on a topic in an integrated way such that new frameworks and perspectives on the topic are generated. The body of literature includes all studies that address related or identical hypotheses. A well-done integrative review meets the same standards as primary research in regard to clarity, rigor, and replication.

Historical Review      Few things rest in isolation from historical precedent. Historical reviews are focused on examining research throughout a period of time, often starting with the first time an issue, concept, theory, phenomena emerged in the literature, then tracing its evolution within the scholarship of a discipline. The purpose is to place research in a historical context to show familiarity with state-of-the-art developments and to identify the likely directions for future research.

Methodological Review      A review does not always focus on what someone said [content], but how they said it [method of analysis]. This approach provides a framework of understanding at different levels (i.e. those of theory, substantive fields, research approaches and data collection and analysis techniques), enables researchers to draw on a wide variety of knowledge ranging from the conceptual level to practical documents for use in fieldwork in the areas of ontological and epistemological consideration, quantitative and qualitative integration, sampling, interviewing, data collection and data analysis, and helps highlight many ethical issues which we should be aware of and consider as we go through our study.

Systematic Review      This form consists of an overview of existing evidence pertinent to a clearly formulated research question, which uses pre-specified and standardized methods to identify and critically appraise relevant research, and to collect, report, and analyse data from the studies that are included in the review. Typically it focuses on a very specific empirical question, often posed in a cause-and-effect form, such as "To what extent does A contribute to B?"

Theoretical Review      The purpose of this form is to concretely examine the corpus of theory that has accumulated in regard to an issue, concept, theory, phenomena. The theoretical literature review help establish what theories already exist, the relationships between them, to what degree the existing theories have been investigated, and to develop new hypotheses to be tested. Often this form is used to help establish a lack of appropriate theories or reveal that current theories are inadequate for explaining new or emerging research problems. The unit of analysis can focus on a theoretical concept or a whole theory or framework.

* Kennedy, Mary M. "Defining a Literature." Educational Researcher 36 (April 2007): 139-147.

All content is from The Literature Review created by Dr. Robert Larabee USC

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Educational Leadership: Literature Review Strategies

• Literature Review Strategies
• Search Tips

What's a Literature Review?

A Literature Review...

• Provides comprehensive discussion of the scholarly research that has already been done on a topic.
• Includes some summary of important articles on a topic.
• Includes comparison: between how different authors discuss the same topic and how the topic has been handled over time.
• Synthesizes previous ideas on a topic, but also looks for gaps in the literature: what needs to be investigated further?

What Should a Literature Review Do?

A Literature Review should...

• Relate directly and clearly to your thesis or research question.
• Synthesize and contextualize results, not just report them.
• Identify areas of controversy in the literature.
• Formulate questions that need further research.

Adapted from “The Literature Review: A Few Tips on Conducting It”, by Dena Taylor and Margaret Procter, University of Toronto: www.writing.utoronto.ca (file linked below)

• The Literature Review: A Few Tips on Conducting It This two-page PDF handout created by Dena Taylor and Margaret Procter at the University of Toronto has excellent guidance on conducting a literature review.

Literature Review Search Strategies

Strategies for a literature review search...

• Comb through bibliographies of relevant journal articles and books. You'll probably start to see patterns: authors, journals, and themes that show up over and over.
• Find Full Text through the Library : If you find an article in a bibliography that you’d like to access, look for the journal name (not the article name), and follow the steps outlined under the Finding Full-text Material tab in our How to find Full Text Guide .
• Can't get the article you need in full text through PSU? Don't Despair: Try Interlibrary Loan !
• Find out who cited an article , and how many times it was cited, through Google Scholar . This will show you how influential an article was and gives you more articles and authors to investigate.
• Learn How to Gut a Book -- in other words, how to get the most out of a book in the most efficient manner (i.e. it may not be necessary to read an entire book, word for word, taking diligent notes in order to get the gist of the book for use in a literature review).

Journal Ranking, Publication Outlets, Scholarly Communication

What are the top journals in your field? Which journals are the best for your topic?

The following resources can help you answer the following questions, which can be helpful to consider when performing a literature review:

• SCImago Journal & Country Rank Journals and country scientific indicators based on data in the Scopus® database.
• Eigenfactor Free website ranking and mapping academic journals.

• Academic Publishing Information on authors' rights, copyright, open access, and more.

Cited Reference Search

How many times has one of the articles you're using in your literature review been cited?

The answer to that question can tell you not only how influential an article has been, but can lead you to more articles on your topic. Use the following to find out how many times the article you're using has been cited:

Getting Started With Research: Tutorials

Need more help getting started with research? Check out the Library's video tutorials and playlists  .

Please also feel free to contact a librarian .

Literature Reviews: An Overview for Graduate Students

This excellent overview of the literature review explains what a literature review and outlines processes and best practices for doing one. It includes input from an NCSU professor on what a literature review is and what it should do. (Shared under a CC BY-NC-SA 3.0 US license, attributed to North Carolina State University Libraries).

Writing the Literature Review: Part 1

Here's another excellent tutorial on what a literature review is and how to write it, in two parts, from David Taylor at the University of Maryland University College's Writing Program.  https://youtu.be/2IUZWZX4OGI

Writing the Literature Review: Part 2

Here's part two of David Taylor's "Writing the Literature Review" tutorial, from the University of Maryland University College's Writing Program. https://youtu.be/UoYpyY9n9YQ

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15 Literature Review Examples

Chris Drew (PhD)

Dr. Chris Drew is the founder of the Helpful Professor. He holds a PhD in education and has published over 20 articles in scholarly journals. He is the former editor of the Journal of Learning Development in Higher Education. [Image Descriptor: Photo of Chris]

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Literature reviews are a necessary step in a research process and often required when writing your research proposal . They involve gathering, analyzing, and evaluating existing knowledge about a topic in order to find gaps in the literature where future studies will be needed.

Ideally, once you have completed your literature review, you will be able to identify how your research project can build upon and extend existing knowledge in your area of study.

Generally, for my undergraduate research students, I recommend a narrative review, where themes can be generated in order for the students to develop sufficient understanding of the topic so they can build upon the themes using unique methods or novel research questions.

If you’re in the process of writing a literature review, I have developed a literature review template for you to use – it’s a huge time-saver and walks you through how to write a literature review step-by-step:

Get your time-saving templates here to write your own literature review.

Literature Review Examples

For the following types of literature review, I present an explanation and overview of the type, followed by links to some real-life literature reviews on the topics.

1. Narrative Review Examples

Also known as a traditional literature review, the narrative review provides a broad overview of the studies done on a particular topic.

It often includes both qualitative and quantitative studies and may cover a wide range of years.

The narrative review’s purpose is to identify commonalities, gaps, and contradictions in the literature .

I recommend to my students that they should gather their studies together, take notes on each study, then try to group them by themes that form the basis for the review (see my step-by-step instructions at the end of the article).

Example Study

Title: Communication in healthcare: a narrative review of the literature and practical recommendations

Citation: Vermeir, P., Vandijck, D., Degroote, S., Peleman, R., Verhaeghe, R., Mortier, E., … & Vogelaers, D. (2015). Communication in healthcare: a narrative review of the literature and practical recommendations. International journal of clinical practice , 69 (11), 1257-1267.

Source: https://onlinelibrary.wiley.com/doi/pdf/10.1111/ijcp.12686  

Overview: This narrative review analyzed themes emerging from 69 articles about communication in healthcare contexts. Five key themes were found in the literature: poor communication can lead to various negative outcomes, discontinuity of care, compromise of patient safety, patient dissatisfaction, and inefficient use of resources. After presenting the key themes, the authors recommend that practitioners need to approach healthcare communication in a more structured way, such as by ensuring there is a clear understanding of who is in charge of ensuring effective communication in clinical settings.

Other Examples

• Burnout in United States Healthcare Professionals: A Narrative Review (Reith, 2018) – read here
• Examining the Presence, Consequences, and Reduction of Implicit Bias in Health Care: A Narrative Review (Zestcott, Blair & Stone, 2016) – read here
• A Narrative Review of School-Based Physical Activity for Enhancing Cognition and Learning (Mavilidi et al., 2018) – read here
• A narrative review on burnout experienced by medical students and residents (Dyrbye & Shanafelt, 2015) – read here

2. Systematic Review Examples

This type of literature review is more structured and rigorous than a narrative review. It involves a detailed and comprehensive plan and search strategy derived from a set of specified research questions.

The key way you’d know a systematic review compared to a narrative review is in the methodology: the systematic review will likely have a very clear criteria for how the studies were collected, and clear explanations of exclusion/inclusion criteria. 

The goal is to gather the maximum amount of valid literature on the topic, filter out invalid or low-quality reviews, and minimize bias. Ideally, this will provide more reliable findings, leading to higher-quality conclusions and recommendations for further research.

You may note from the examples below that the ‘method’ sections in systematic reviews tend to be much more explicit, often noting rigid inclusion/exclusion criteria and exact keywords used in searches.

Title: The importance of food naturalness for consumers: Results of a systematic review  

Citation: Roman, S., Sánchez-Siles, L. M., & Siegrist, M. (2017). The importance of food naturalness for consumers: Results of a systematic review. Trends in food science & technology , 67 , 44-57.

Source: https://www.sciencedirect.com/science/article/pii/S092422441730122X  

Overview: This systematic review included 72 studies of food naturalness to explore trends in the literature about its importance for consumers. Keywords used in the data search included: food, naturalness, natural content, and natural ingredients. Studies were included if they examined consumers’ preference for food naturalness and contained empirical data. The authors found that the literature lacks clarity about how naturalness is defined and measured, but also found that food consumption is significantly influenced by perceived naturalness of goods.

• A systematic review of research on online teaching and learning from 2009 to 2018 (Martin, Sun & Westine, 2020) – read here
• Where Is Current Research on Blockchain Technology? (Yli-Huumo et al., 2016) – read here
• Universities—industry collaboration: A systematic review (Ankrah & Al-Tabbaa, 2015) – read here
• Internet of Things Applications: A Systematic Review (Asghari, Rahmani & Javadi, 2019) – read here

3. Meta-analysis

This is a type of systematic review that uses statistical methods to combine and summarize the results of several studies.

Due to its robust methodology, a meta-analysis is often considered the ‘gold standard’ of secondary research , as it provides a more precise estimate of a treatment effect than any individual study contributing to the pooled analysis.

Furthermore, by aggregating data from a range of studies, a meta-analysis can identify patterns, disagreements, or other interesting relationships that may have been hidden in individual studies.

This helps to enhance the generalizability of findings, making the conclusions drawn from a meta-analysis particularly powerful and informative for policy and practice.

Title: Cholesterol and Alzheimer’s Disease Risk: A Meta-Meta-Analysis

Citation: Sáiz-Vazquez, O., Puente-Martínez, A., Ubillos-Landa, S., Pacheco-Bonrostro, J., & Santabárbara, J. (2020). Cholesterol and Alzheimer’s disease risk: a meta-meta-analysis. Brain sciences, 10(6), 386.

Source: https://doi.org/10.3390/brainsci10060386  

O verview: This study examines the relationship between cholesterol and Alzheimer’s disease (AD). Researchers conducted a systematic search of meta-analyses and reviewed several databases, collecting 100 primary studies and five meta-analyses to analyze the connection between cholesterol and Alzheimer’s disease. They find that the literature compellingly demonstrates that low-density lipoprotein cholesterol (LDL-C) levels significantly influence the development of Alzheimer’s disease.

• The power of feedback revisited: A meta-analysis of educational feedback research (Wisniewski, Zierer & Hattie, 2020) – read here
• How Much Does Education Improve Intelligence? A Meta-Analysis (Ritchie & Tucker-Drob, 2018) – read here
• A meta-analysis of factors related to recycling (Geiger et al., 2019) – read here
• Stress management interventions for police officers and recruits (Patterson, Chung & Swan, 2014) – read here

Other Types of Reviews

• Scoping Review: This type of review is used to map the key concepts underpinning a research area and the main sources and types of evidence available. It can be undertaken as stand-alone projects in their own right, or as a precursor to a systematic review.
• Rapid Review: This type of review accelerates the systematic review process in order to produce information in a timely manner. This is achieved by simplifying or omitting stages of the systematic review process.
• Integrative Review: This review method is more inclusive than others, allowing for the simultaneous inclusion of experimental and non-experimental research. The goal is to more comprehensively understand a particular phenomenon.
• Critical Review: This is similar to a narrative review but requires a robust understanding of both the subject and the existing literature. In a critical review, the reviewer not only summarizes the existing literature, but also evaluates its strengths and weaknesses. This is common in the social sciences and humanities .
• State-of-the-Art Review: This considers the current level of advancement in a field or topic and makes recommendations for future research directions. This type of review is common in technological and scientific fields but can be applied to any discipline.

How to Write a Narrative Review (Tips for Undergrad Students)

Most undergraduate students conducting a capstone research project will be writing narrative reviews. Below is a five-step process for conducting a simple review of the literature for your project.

• Search for Relevant Literature: Use scholarly databases related to your field of study, provided by your university library, along with appropriate search terms to identify key scholarly articles that have been published on your topic.
• Evaluate and Select Sources: Filter the source list by selecting studies that are directly relevant and of sufficient quality, considering factors like credibility , objectivity, accuracy, and validity.
• Analyze and Synthesize: Review each source and summarize the main arguments  in one paragraph (or more, for postgrad). Keep these summaries in a table.
• Identify Themes: With all studies summarized, group studies that share common themes, such as studies that have similar findings or methodologies.
• Write the Review: Write your review based upon the themes or subtopics you have identified. Give a thorough overview of each theme, integrating source data, and conclude with a summary of the current state of knowledge then suggestions for future research based upon your evaluation of what is lacking in the literature.

Literature reviews don’t have to be as scary as they seem. Yes, they are difficult and require a strong degree of comprehension of academic studies. But it can be feasibly done through following a structured approach to data collection and analysis. With my undergraduate research students (who tend to conduct small-scale qualitative studies ), I encourage them to conduct a narrative literature review whereby they can identify key themes in the literature. Within each theme, students can critique key studies and their strengths and limitations , in order to get a lay of the land and come to a point where they can identify ways to contribute new insights to the existing academic conversation on their topic.

Ankrah, S., & Omar, A. T. (2015). Universities–industry collaboration: A systematic review. Scandinavian Journal of Management, 31(3), 387-408.

Asghari, P., Rahmani, A. M., & Javadi, H. H. S. (2019). Internet of Things applications: A systematic review. Computer Networks , 148 , 241-261.

Dyrbye, L., & Shanafelt, T. (2016). A narrative review on burnout experienced by medical students and residents. Medical education , 50 (1), 132-149.

Geiger, J. L., Steg, L., Van Der Werff, E., & Ünal, A. B. (2019). A meta-analysis of factors related to recycling. Journal of environmental psychology , 64 , 78-97.

Martin, F., Sun, T., & Westine, C. D. (2020). A systematic review of research on online teaching and learning from 2009 to 2018. Computers & education , 159 , 104009.

Mavilidi, M. F., Ruiter, M., Schmidt, M., Okely, A. D., Loyens, S., Chandler, P., & Paas, F. (2018). A narrative review of school-based physical activity for enhancing cognition and learning: The importance of relevancy and integration. Frontiers in psychology , 2079.

Patterson, G. T., Chung, I. W., & Swan, P. W. (2014). Stress management interventions for police officers and recruits: A meta-analysis. Journal of experimental criminology , 10 , 487-513.

Reith, T. P. (2018). Burnout in United States healthcare professionals: a narrative review. Cureus , 10 (12).

Ritchie, S. J., & Tucker-Drob, E. M. (2018). How much does education improve intelligence? A meta-analysis. Psychological science , 29 (8), 1358-1369.

Roman, S., Sánchez-Siles, L. M., & Siegrist, M. (2017). The importance of food naturalness for consumers: Results of a systematic review. Trends in food science & technology , 67 , 44-57.

Sáiz-Vazquez, O., Puente-Martínez, A., Ubillos-Landa, S., Pacheco-Bonrostro, J., & Santabárbara, J. (2020). Cholesterol and Alzheimer’s disease risk: a meta-meta-analysis. Brain sciences, 10(6), 386.

Vermeir, P., Vandijck, D., Degroote, S., Peleman, R., Verhaeghe, R., Mortier, E., … & Vogelaers, D. (2015). Communication in healthcare: a narrative review of the literature and practical recommendations. International journal of clinical practice , 69 (11), 1257-1267.

Wisniewski, B., Zierer, K., & Hattie, J. (2020). The power of feedback revisited: A meta-analysis of educational feedback research. Frontiers in Psychology , 10 , 3087.

Yli-Huumo, J., Ko, D., Choi, S., Park, S., & Smolander, K. (2016). Where is current research on blockchain technology?—a systematic review. PloS one , 11 (10), e0163477.

Zestcott, C. A., Blair, I. V., & Stone, J. (2016). Examining the presence, consequences, and reduction of implicit bias in health care: a narrative review. Group Processes & Intergroup Relations , 19 (4), 528-542

• Chris Drew (PhD) https://helpfulprofessor.com/author/chris-drew-phd/ 101 Class Group Name Ideas (for School Students)
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• Chris Drew (PhD) https://helpfulprofessor.com/author/chris-drew-phd/ All 6 Levels of Understanding (on Bloom’s Taxonomy)

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Systematic Reviews in Educational Research: Methodology, Perspectives and Application

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• First Online: 22 November 2019

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• David Gough 6  

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This chapter explores the processes of reviewing literature as a research method. The logic of the family of research approaches called systematic review is analysed and the variation in techniques used in the different approaches explored using examples from existing reviews. The key distinctions between aggregative and configurative approaches are illustrated and the chapter signposts further reading on key issues in the systematic review process.

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Reviewing Literature for and as Research

Methodological Approaches to Literature Review

Authentic Use of Hattie’s Meta-analyses to Frame Educational Research: a Researcher’s Reflection

1 what are systematic reviews.

A literature review is a scholarly paper which provides an overview of current knowledge about a topic. It will typically include substantive findings, as well as theoretical and methodological contributions to a particular topic (Hart 2018 , p. xiii). Traditionally in education ‘reviewing the literature’ and ‘doing research’ have been viewed as distinct activities. Consider the standard format of research proposals, which usually have some kind of ‘review’ of existing knowledge presented distinctly from the methods of the proposed new primary research. However, both reviews and research are undertaken in order to find things out. Reviews to find out what is already known from pre-existing research about a phenomena, subject or topic; new primary research to provide answers to questions about which existing research does not provide clear and/or complete answers.

When we use the term research in an academic sense it is widely accepted that we mean a process of asking questions and generating knowledge to answer these questions using rigorous accountable methods. As we have noted, reviews also share the same purposes of generating knowledge but historically we have not paid as much attention to the methods used for reviewing existing literature as we have to the methods used for primary research. Literature reviews can be used for making claims about what we know and do not know about a phenomenon and also about what new research we need to undertake to address questions that are unanswered. Therefore, it seems reasonable to conclude that ‘how’ we conduct a review of research is important.

The increased focus on the use of research evidence to inform policy and practice decision-making in Evidence Informed Education (Hargreaves 1996 ; Nelson and Campbell 2017 ) has increased the attention given to contextual and methodological limitations of research evidence provided by single studies. Reviews of research may help address these concerns when carried on in a systematic, rigorous and transparent manner. Thus, again emphasizing the importance of ‘how’ reviews are completed.

The logic of systematic reviews is that reviews are a form of research and thus can be improved by using appropriate and explicit methods. As the methods of systematic review have been applied to different types of research questions, there has been an increasing plurality of types of systematic review. Thus, the term ‘systematic review’ is used in this chapter to refer to a family of research approaches that are a form of secondary level analysis (secondary research) that brings together the findings of primary research to answer a research question. Systematic reviews can therefore be defined as “a review of existing research using explicit, accountable rigorous research methods” (Gough et al. 2017 , p. 4).

2 Variation in Review Methods

Reviews can address a diverse range of research questions. Consequently, as with primary research, there are many different approaches and methods that can be applied. The choices should be dictated by the review questions. These are shaped by reviewers’ assumptions about the meaning of a particular research question, the approach and methods that are best used to investigate it. Attempts to classify review approaches and methods risk making hard distinctions between methods and thereby to distract from the common defining logics that these approaches often share. A useful broad distinction is between reviews that follow a broadly configurative synthesis logic and reviews that follow a broadly aggregative synthesis logic (Sandelowski et al. 2012 ). However, it is important to keep in mind that most reviews have elements of both (Gough et al. 2012 ).

Reviews that follow a broadly configurative synthesis logic approach usually investigate research questions about meaning and interpretation to explore and develop theory. They tend to use exploratory and iterative review methods that emerge throughout the process of the review. Studies included in the review are likely to have investigated the phenomena of interest using methods such as interviews and observations, with data in the form of text. Reviewers are usually interested in purposive variety in the identification and selection of studies. Study quality is typically considered in terms of authenticity. Synthesis consists of the deliberative configuring of data by reviewers into patterns to create a richer conceptual understanding of a phenomenon. For example, meta ethnography (Noblit and Hare 1988 ) uses ethnographic data analysis methods to explore and integrate the findings of previous ethnographies in order to create higher-level conceptual explanations of phenomena. There are many other review approaches that follow a broadly configurative logic (for an overview see Barnett-Page and Thomas 2009 ); reflecting the variety of methods used in primary research in this tradition.

Reviews that follow a broadly aggregative synthesis logic usually investigate research questions about impacts and effects. For example, systematic reviews that seek to measure the impact of an educational intervention test the hypothesis that an intervention has the impact that has been predicted. Reviews following an aggregative synthesis logic do not tend to develop theory directly; though they can contribute by testing, exploring and refining theory. Reviews following an aggregative synthesis logic tend to specify their methods in advance (a priori) and then apply them without any deviation from a protocol. Reviewers are usually concerned to identify the comprehensive set of studies that address the research question. Studies included in the review will usually seek to determine whether there is a quantitative difference in outcome between groups receiving and not receiving an intervention. Study quality assessment in reviews following an aggregative synthesis logic focusses on the minimisation of bias and thus selection pays particular attention to homogeneity between studies. Synthesis aggregates, i.e. counts and adds together, the outcomes from individual studies using, for example, statistical meta-analysis to provide a pooled summary of effect.

3 The Systematic Review Process

Different types of systematic review are discussed in more detail later in this chapter. The majority of systematic review types share a common set of processes. These processes can be divided into distinct but interconnected stages as illustrated in Fig.  1 . Systematic reviews need to specify a research question and the methods that will be used to investigate the question. This is often written as a ‘protocol’ prior to undertaking the review. Writing a protocol or plan of the methods at the beginning of a review can be a very useful activity. It helps the review team to gain a shared understanding of the scope of the review and the methods that they will use to answer the review’s questions. Different types of systematic reviews will have more or less developed protocols. For example, for systematic reviews investigating research questions about the impact of educational interventions it is argued that a detailed protocol should be fully specified prior to the commencement of the review to reduce the possibility of reviewer bias (Torgerson 2003 , p. 26). For other types of systematic review, in which the research question is more exploratory, the protocol may be more flexible and/or developmental in nature.

The systematic review process

3.1 Systematic Review Questions and the Conceptual Framework

The review question gives each review its particular structure and drives key decisions about what types of studies to include; where to look for them; how to assess their quality; and how to combine their findings. Although a research question may appear to be simple, it will include many assumptions. Whether implicit or explicit, these assumptions will include: epistemological frameworks about knowledge and how we obtain it, theoretical frameworks, whether tentative or firm, about the phenomenon that is the focus of study.

Taken together, these produce a conceptual framework that shapes the research questions, choices about appropriate systematic review approach and methods. The conceptual framework may be viewed as a working hypothesis that can be developed, refined or confirmed during the course of the research. Its purpose is to explain the key issues to be studied, the constructs or variables, and the presumed relationships between them. The framework is a research tool intended to assist a researcher to develop awareness and understanding of the phenomena under scrutiny and to communicate this (Smyth 2004 ).

A review to investigate the impact of an educational intervention will have a conceptual framework that includes a hypothesis about a causal link between; who the review is about (the people), what the review is about (an intervention and what it is being compared with), and the possible consequences of intervention on the educational outcomes of these people. Such a review would follow a broadly aggregative synthesis logic. This is the shape of reviews of educational interventions carried out for the What Works Clearing House in the USA Footnote 1 and the Education Endowment Foundation in England. Footnote 2

A review to investigate meaning or understanding of a phenomenon for the purpose of building or further developing theory will still have some prior assumptions. Thus, an initial conceptual framework will contain theoretical ideas about how the phenomena of interest can be understood and some ideas justifying why a particular population and/or context is of specific interest or relevance. Such a review is likely to follow a broadly configurative logic.

3.2 Selection Criteria

Reviewers have to make decisions about which research studies to include in their review. In order to do this systematically and transparently they develop rules about which studies can be selected into the review. Selection criteria (sometimes referred to as inclusion or exclusion criteria) create restrictions on the review. All reviews, whether systematic or not, limit in some way the studies that are considered by the review. Systematic reviews simply make these restrictions transparent and therefore consistent across studies. These selection criteria are shaped by the review question and conceptual framework. For example, a review question about the impact of homework on educational attainment would have selection criteria specifying who had to do the homework; the characteristics of the homework and the outcomes that needed to be measured. Other commonly used selection criteria include study participant characteristics; the country where the study has taken place and the language in which the study is reported. The type of research method(s) may also be used as a selection criterion but this can be controversial given the lack of consensus in education research (Newman 2008 ), and the inconsistent terminology used to describe education research methods.

3.3 Developing the Search Strategy

The search strategy is the plan for how relevant research studies will be identified. The review question and conceptual framework shape the selection criteria. The selection criteria specify the studies to be included in a review and thus are a key driver of the search strategy. A key consideration will be whether the search aims to be exhaustive i.e. aims to try and find all the primary research that has addressed the review question. Where reviews address questions about effectiveness or impact of educational interventions the issue of publication bias is a concern. Publication bias is the phenomena whereby smaller and/or studies with negative findings are less likely to be published and/or be harder to find. We may therefore inadvertently overestimate the positive effects of an educational intervention because we do not find studies with negative or smaller effects (Chow and Eckholm 2018 ). Where the review question is not of this type then a more specific or purposive search strategy, that may or may not evolve as the review progresses, may be appropriate. This is similar to sampling approaches in primary research. In primary research studies using aggregative approaches, such as quasi-experiments, analysis is based on the study of complete or representative samples. In primary research studies using configurative approaches, such as ethnography, analysis is based on examining a range of instances of the phenomena in similar or different contexts.

The search strategy will detail the sources to be searched and the way in which the sources will be searched. A list of search source types is given in Box 1 below. An exhaustive search strategy would usually include all of these sources using multiple bibliographic databases. Bibliographic databases usually index academic journals and thus are an important potential source. However, in most fields, including education, relevant research is published in a range of journals which may be indexed in different bibliographic databases and thus it may be important to search multiple bibliographic databases. Furthermore, some research is published in books and an increasing amount of research is not published in academic journals or at least may not be published there first. Thus, it is important to also consider how you will find relevant research in other sources including ‘unpublished’ or ‘grey’ literature. The Internet is a valuable resource for this purpose and should be included as a source in any search strategy.

Box 1: Search Sources

The World Wide Web/Internet

Google, Specialist Websites, Google Scholar, Microsoft Academic

Bibliographic Databases

Subject specific e.g. Education—ERIC: Education Resources Information Centre

Generic e.g. ASSIA: Applied Social Sciences Index and Abstracts

Handsearching of specialist journals or books

Contacts with Experts

Citation Checking

New, federated search engines are being developed, which search multiple sources at the same time, eliminating duplicates automatically (Tsafnat et al. 2013 ). Technologies, including text mining, are being used to help develop search strategies, by suggesting topics and terms on which to search—terms that reviewers may not have thought of using. Searching is also being aided by technology through the increased use (and automation) of ‘citation chasing’, where papers that cite, or are cited by, a relevant study are checked in case they too are relevant.

A search strategy will identify the search terms that will be used to search the bibliographic databases. Bibliographic databases usually index records according to their topic using ‘keywords’ or ‘controlled terms’ (categories used by the database to classify papers). A comprehensive search strategy usually involves searching both a freetext search using keywords determined by the reviewers and controlled terms. An example of a bibliographic database search is given in Box 2. This search was used in a review that aimed to find studies that investigated the impact of Youth Work on positive youth outcomes (Dickson et al. 2013 ). The search is built using terms for the population of interest (Youth), the intervention of interest (Youth Work) and the outcomes of Interest (Positive Development). It used both keywords and controlled terms, ‘wildcards’ (the *sign in this database) and the Boolean operators ‘OR’ and ‘AND’ to combine terms. This example illustrates the potential complexity of bibliographic database search strings, which will usually require a process of iterative development to finalise.

Box 2: Search string example To identify studies that address the question What is the empirical research evidence on the impact of youth work on the lives of children and young people aged 10-24 years?: CSA ERIC Database

((TI = (adolescen* or (“young man*”) or (“young men”)) or TI = ((“young woman*”) or (“young women”) or (Young adult*”)) or TI = ((“young person*”) or (“young people*”) or teen*) or AB = (adolescen* or (“young man*”) or (“young men”)) or AB = ((“young woman*”) or (“young women”) or (Young adult*”)) or AB = ((“young person*”) or (“young people*”) or teen*)) or (DE = (“youth” or “adolescents” or “early adolescents” or “late adolescents” or “preadolescents”))) and(((TI = ((“positive youth development “) or (“youth development”) or (“youth program*”)) or TI = ((“youth club*”) or (“youth work”) or (“youth opportunit*”)) or TI = ((“extended school*”) or (“civic engagement”) or (“positive peer culture”)) or TI = ((“informal learning”) or multicomponent or (“multi-component “)) or TI = ((“multi component”) or multidimensional or (“multi-dimensional “)) or TI = ((“multi dimensional”) or empower* or asset*) or TI = (thriv* or (“positive development”) or resilienc*) or TI = ((“positive activity”) or (“positive activities”) or experiential) or TI = ((“community based”) or “community-based”)) or(AB = ((“positive youth development “) or (“youth development”) or (“youth program*”)) or AB = ((“youth club*”) or (“youth work”) or (“youth opportunit*”)) or AB = ((“extended school*”) or (“civic engagement”) or (“positive peer culture”)) or AB = ((“informal learning”) or multicomponent or (“multi-component “)) or AB = ((“multi component”) or multidimensional or (“multi-dimensional “)) or AB = ((“multi dimensional”) or empower* or asset*) or AB = (thriv* or (“positive development”) or resilienc*) or AB = ((“positive activity”) or (“positive activities”) or experiential) or AB = ((“community based”) or “community-based”))) or (DE=”community education”))

Detailed guidance for finding effectiveness studies is available from the Campbell Collaboration (Kugley et al. 2015 ). Guidance for finding a broader range of studies has been produced by the EPPI-Centre (Brunton et al. 2017a ).

3.4 The Study Selection Process

Studies identified by the search are subject to a process of checking (sometimes referred to as screening) to ensure they meet the selection criteria. This is usually done in two stages whereby titles and abstracts are checked first to determine whether the study is likely to be relevant and then a full copy of the paper is acquired to complete the screening exercise. The process of finding studies is not efficient. Searching bibliographic databases, for example, leads to many irrelevant studies being found which then have to be checked manually one by one to find the few relevant studies. There is increasing use of specialised software to support and in some cases, automate the selection process. Text mining, for example, can assist in selecting studies for a review (Brunton et al. 2017b ). A typical text mining or machine learning process might involve humans undertaking some screening, the results of which are used to train the computer software to learn the difference between included and excluded studies and thus be able to indicate which of the remaining studies are more likely to be relevant. Such automated support may result in some errors in selection, but this may be less than the human error in manual selection (O’Mara-Eves et al. 2015 ).

3.5 Coding Studies

Once relevant studies have been selected, reviewers need to systematically identify and record the information from the study that will be used to answer the review question. This information includes the characteristics of the studies, including details of the participants and contexts. The coding describes: (i) details of the studies to enable mapping of what research has been undertaken; (ii) how the research was undertaken to allow assessment of the quality and relevance of the studies in addressing the review question; (iii) the results of each study so that these can be synthesised to answer the review question.

The information is usually coded into a data collection system using some kind of technology that facilitates information storage and analysis (Brunton et al. 2017b ) such as the EPPI-Centre’s bespoke systematic review software EPPI Reviewer. Footnote 3 Decisions about which information to record will be made by the review team based on the review question and conceptual framework. For example, a systematic review about the relationship between school size and student outcomes collected data from the primary studies about each schools funding, students, teachers and school organisational structure as well as about the research methods used in the study (Newman et al. 2006 ). The information coded about the methods used in the research will vary depending on the type of research included and the approach that will be used to assess the quality and relevance of the studies (see the next section for further discussion of this point).

Similarly, the information recorded as ‘results’ of the individual studies will vary depending on the type of research that has been included and the approach to synthesis that will be used. Studies investigating the impact of educational interventions using statistical meta-analysis as a synthesis technique will require all of the data necessary to calculate effect sizes to be recorded from each study (see the section on synthesis below for further detail on this point). However, even in this type of study there will be multiple data that can be considered to be ‘results’ and so which data needs to be recorded from studies will need to be carefully specified so that recording is consistent across studies

3.6 Appraising the Quality of Studies

Methods are reinvented every time they are used to accommodate the real world of research practice (Sandelowski et al. 2012 ). The researcher undertaking a primary research study has attempted to design and execute a study that addresses the research question as rigorously as possible within the parameters of their resources, understanding, and context. Given the complexity of this task, the contested views about research methods and the inconsistency of research terminology, reviewers will need to make their own judgements about the quality of the any individual piece of research included in their review. From this perspective, it is evident that using a simple criteria, such as ‘published in a peer reviewed journal’ as a sole indicator of quality, is not likely to be an adequate basis for considering the quality and relevance of a study for a particular systematic review.

In the context of systematic reviews this assessment of quality is often referred to as Critical Appraisal (Petticrew and Roberts 2005 ). There is considerable variation in what is done during critical appraisal: which dimensions of study design and methods are considered; the particular issues that are considered under each dimension; the criteria used to make judgements about these issues and the cut off points used for these criteria (Oancea and Furlong 2007 ). There is also variation in whether the quality assessment judgement is used for excluding studies or weighting them in analysis and when in the process judgements are made.

There are broadly three elements that are considered in critical appraisal: the appropriateness of the study design in the context of the review question, the quality of the execution of the study methods and the study’s relevance to the review question (Gough 2007 ). Distinguishing study design from execution recognises that whilst a particular design may be viewed as more appropriate for a study it also needs to be well executed to achieve the rigour or trustworthiness attributed to the design. Study relevance is achieved by the review selection criteria but assessing the degree of relevance recognises that some studies may be less relevant than others due to differences in, for example, the characteristics of the settings or the ways that variables are measured.

The assessment of study quality is a contested and much debated issue in all research fields. Many published scales are available for assessing study quality. Each incorporates criteria relevant to the research design being evaluated. Quality scales for studies investigating the impact of interventions using (quasi) experimental research designs tend to emphasis establishing descriptive causality through minimising the effects of bias (for detailed discussion of issues associated with assessing study quality in this tradition see Waddington et al. 2017 ). Quality scales for appraising qualitative research tend to focus on the extent to which the study is authentic in reflecting on the meaning of the data (for detailed discussion of the issues associated with assessing study quality in this tradition see Carroll and Booth 2015 ).

3.7 Synthesis

A synthesis is more than a list of findings from the included studies. It is an attempt to integrate the information from the individual studies to produce a ‘better’ answer to the review question than is provided by the individual studies. Each stage of the review contributes toward the synthesis and so decisions made in earlier stages of the review shape the possibilities for synthesis. All types of synthesis involve some kind of data transformation that is achieved through common analytic steps: searching for patterns in data; Checking the quality of the synthesis; Integrating data to answer the review question (Thomas et al. 2012 ). The techniques used to achieve these vary for different types of synthesis and may appear more or less evident as distinct steps.

Statistical meta-analysis is an aggregative synthesis approach in which the outcome results from individual studies are transformed into a standardized, scale free, common metric and combined to produce a single pooled weighted estimate of effect size and direction. There are a number of different metrics of effect size, selection of which is principally determined by the structure of outcome data in the primary studies as either continuous or dichotomous. Outcome data with a dichotomous structure can be transformed into Odds Ratios (OR), Absolute Risk Ratios (ARR) or Relative Risk Ratios (RRR) (for detailed discussion of dichotomous outcome effect sizes see Altman 1991 ). More commonly seen in education research, outcome data with a continuous structure can be translated into Standardised Mean Differences (SMD) (Fitz-Gibbon 1984 ). At its most straightforward effect size calculation is simple arithmetic. However given the variety of analysis methods used and the inconsistency of reporting in primary studies it is also possible to calculate effect sizes using more complex transformation formulae (for detailed instructions on calculating effect sizes from a wide variety of data presentations see Lipsey and Wilson 2000 ).

The combination of individual effect sizes uses statistical procedures in which weighting is given to the effect sizes from the individual studies based on different assumptions about the causes of variance and this requires the use of statistical software. Statistical measures of heterogeneity produced as part of the meta-analysis are used to both explore patterns in the data and to assess the quality of the synthesis (Thomas et al. 2017a ).

In configurative synthesis the different kinds of text about individual studies and their results are meshed and linked to produce patterns in the data, explore different configurations of the data and to produce new synthetic accounts of the phenomena under investigation. The results from the individual studies are translated into and across each other, searching for areas of commonality and refutation. The specific techniques used are derived from the techniques used in primary research in this tradition. They include reading and re-reading, descriptive and analytical coding, the development of themes, constant comparison, negative case analysis and iteration with theory (Thomas et al. 2017b ).

4 Variation in Review Structures

All research requires time and resources and systematic reviews are no exception. There is always concern to use resources as efficiently as possible. For these reasons there is a continuing interest in how reviews can be carried out more quickly using fewer resources. A key issue is the basis for considering a review to be systematic. Any definitions are clearly open to interpretation. Any review can be argued to be insufficiently rigorous and explicit in method in any part of the review process. To assist reviewers in being rigorous, reporting standards and appraisal tools are being developed to assess what is required in different types of review (Lockwood and Geum Oh 2017 ) but these are also the subject of debate and disagreement.

In addition to the term ‘systematic review’ other terms are used to denote the outputs of systematic review processes. Some use the term ‘scoping review’ for a quick review that does not follow a fully systematic process. This term is also used by others (for example, Arksey and O’Malley 2005 ) to denote ‘systematic maps’ that describe the nature of a research field rather than synthesise findings. A ‘quick review’ type of scoping review may also be used as preliminary work to inform a fuller systematic review. Another term used is ‘rapid evidence assessment’. This term is usually used when systematic review needs to be undertaken quickly and in order to do this the methods of review are employed in a more minimal than usual way. For example, by more limited searching. Where such ‘shortcuts’ are taken there may be some loss of rigour, breadth and/or depth (Abrami et al. 2010 ; Thomas et al. 2013 ).

Another development has seen the emergence of the concept of ‘living reviews’, which do not have a fixed end point but are updated as new relevant primary studies are produced. Many review teams hope that their review will be updated over time, but what is different about living reviews is that it is built into the system from the start as an on-going developmental process. This means that the distribution of review effort is quite different to a standard systematic review, being a continuous lower-level effort spread over a longer time period, rather than the shorter bursts of intensive effort that characterise a review with periodic updates (Elliott et al. 2014 ).

4.1 Systematic Maps and Syntheses

One potentially useful aspect of reviewing the literature systematically is that it is possible to gain an understanding of the breadth, purpose and extent of research activity about a phenomenon. Reviewers can be more informed about how research on the phenomenon has been constructed and focused. This type of reviewing is known as ‘mapping’ (see for example, Peersman 1996 ; Gough et al. 2003 ). The aspects of the studies that are described in a map will depend on what is of most interest to those undertaking the review. This might include information such as topic focus, conceptual approach, method, aims, authors, location and context. The boundaries and purposes of a map are determined by decisions made regarding the breadth and depth of the review, which are informed by and reflected in the review question and selection criteria.

Maps can also be a useful stage in a systematic review where study findings are synthesised as well. Most synthesis reviews implicitly or explicitly include some sort of map in that they describe the nature of the relevant studies that they have identified. An explicit map is likely to be more detailed and can be used to inform the synthesis stage of a review. It can provide more information on the individual and grouped studies and thus also provide insights to help inform choices about the focus and strategy to be used in a subsequent synthesis.

4.2 Mixed Methods, Mixed Research Synthesis Reviews

Where studies included in a review consist of more than one type of study design, there may also be different types of data. These different types of studies and data can be analysed together in an integrated design or segregated and analysed separately (Sandelowski et al. 2012 ). In a segregated design, two or more separate sub-reviews are undertaken simultaneously to address different aspects of the same review question and are then compared with one another.

Such ‘mixed methods’ and ‘multiple component’ reviews are usually necessary when there are multiple layers of review question or when one study design alone would be insufficient to answer the question(s) adequately. The reviews are usually required, to have both breadth and depth. In doing so they can investigate a greater extent of the research problem than would be the case in a more focussed single method review. As they are major undertakings, containing what would normally be considered the work of multiple systematic reviews, they are demanding of time and resources and cannot be conducted quickly.

4.3 Reviews of Reviews

Systematic reviews of primary research are secondary levels of research analysis. A review of reviews (sometimes called ‘overviews’ or ‘umbrella’ reviews) is a tertiary level of analysis. It is a systematic map and/or synthesis of previous reviews. The ‘data’ for reviews of reviews are previous reviews rather than primary research studies (see for example Newman et al. ( 2018 ). Some review of reviews use previous reviews to combine both primary research data and synthesis data. It is also possible to have hybrid review models consisting of a review of reviews and then new systematic reviews of primary studies to fill in gaps in coverage where there is not an existing review (Caird et al. 2015 ). Reviews of reviews can be an efficient method for examining previous research. However, this approach is still comparatively novel and questions remain about the appropriate methodology. For example, care is required when assessing the way in which the source systematic reviews identified and selected data for inclusion, assessed study quality and to assess the overlap between the individual reviews (Aromataris et al. 2015 ).

5 Other Types of Research Based Review Structures

This chapter so far has presented a process or method that is shared by many different approaches within the family of systematic review approaches, notwithstanding differences in review question and types of study that are included as evidence. This is a helpful heuristic device for designing and reading systematic reviews. However, it is the case that there are some review approaches that also claim to use a research based review approach but that do not claim to be systematic reviews and or do not conform with the description of processes that we have given above at all or in part at least.

5.1 Realist Synthesis Reviews

Realist synthesis is a member of the theory-based school of evaluation (Pawson 2002 ). This means that it is underpinned by a ‘generative’ understanding of causation, which holds that, to infer a causal outcome/relationship between an intervention (e.g. a training programme) and an outcome (O) of interest (e.g. unemployment), one needs to understand the underlying mechanisms (M) that connect them and the context (C) in which the relationship occurs (e.g. the characteristics of both the subjects and the programme locality). The interest of this approach (and also of other theory driven reviews) is not simply which interventions work, but which mechanisms work in which context. Rather than identifying replications of the same intervention, the reviews adopt an investigative stance and identify different contexts within which the same underlying mechanism is operating.

Realist synthesis is concerned with hypothesising, testing and refining such context-mechanism-outcome (CMO) configurations. Based on the premise that programmes work in limited circumstances, the discovery of these conditions becomes the main task of realist synthesis. The overall intention is to first create an abstract model (based on the CMO configurations) of how and why programmes work and then to test this empirically against the research evidence. Thus, the unit of analysis in a realist synthesis is the programme mechanism, and this mechanism is the basis of the search. This means that a realist synthesis aims to identify different situations in which the same programme mechanism has been attempted. Integrative Reviewing, which is aligned to the Critical Realist tradition, follows a similar approach and methods (Jones-Devitt et al. 2017 ).

5.2 Critical Interpretive Synthesis (CIS)

Critical Interpretive Synthesis (CIS) (Dixon-Woods et al. 2006 ) takes a position that there is an explicit role for the ‘authorial’ (reviewer’s) voice in the review. The approach is derived from a distinctive tradition within qualitative enquiry and draws on some of the tenets of grounded theory in order to support explicitly the process of theory generation. In practice, this is operationalised in its inductive approach to searching and to developing the review question as part of the review process, its rejection of a ‘staged’ approach to reviewing and embracing the concept of theoretical sampling in order to select studies for inclusion. When assessing the quality of studies CIS prioritises relevance and theoretical contribution over research methods. In particular, a critical approach to reading the literature is fundamental in terms of contextualising findings within an analysis of the research traditions or theoretical assumptions of the studies included.

5.3 Meta-Narrative Reviews

Meta-narrative reviews, like critical interpretative synthesis, place centre-stage the importance of understanding the literature critically and understanding differences between research studies as possibly being due to differences between their underlying research traditions (Greenhalgh et al. 2005 ). This means that each piece of research is located (and, when appropriate, aggregated) within its own research tradition and the development of knowledge is traced (configured) through time and across paradigms. Rather than the individual study, the ‘unit of analysis’ is the unfolding ‘storyline’ of a research tradition over time’ (Greenhalgh et al. 2005 ).

6 Conclusions

This chapter has briefly described the methods, application and different perspectives in the family of systematic review approaches. We have emphasized the many ways in which systematic reviews can vary. This variation links to different research aims and review questions. But also to the different assumptions made by reviewers. These assumptions derive from different understandings of research paradigms and methods and from the personal, political perspectives they bring to their research practice. Although there are a variety of possible types of systematic reviews, a distinction in the extent that reviews follow an aggregative or configuring synthesis logic is useful for understanding variations in review approaches and methods. It can help clarify the ways in which reviews vary in the nature of their questions, concepts, procedures, inference and impact. Systematic review approaches continue to evolve alongside critical debate about the merits of various review approaches (systematic or otherwise). So there are many ways in which educational researchers can use and engage with systematic review methods to increase knowledge and understanding in the field of education.

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Newman, M., Gough, D. (2020). Systematic Reviews in Educational Research: Methodology, Perspectives and Application. In: Zawacki-Richter, O., Kerres, M., Bedenlier, S., Bond, M., Buntins, K. (eds) Systematic Reviews in Educational Research. Springer VS, Wiesbaden. https://doi.org/10.1007/978-3-658-27602-7_1

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Literature Review Examples

To give you some examples of writing a literature review and an article analysis matrix to keep track of the themes of your articles, I have created a partial literature review and corresponding analysis matrix to demonstrate. My topic is the special education early intervention program called First Step to Success (FSS).

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The Process of Writing a Literature Review

Mastering synthetic writing is key to a successful literature review. Use these resources to learn how to analyze the articles you want to use for your literature review, keep track of common themes using an article analysis matrix, and how to convert the notes in the analysis matrix into a piece of synthetic writing.

Think of working on your literature review as a multi-step process:

• Identify a topic.
• Find research articles on that topic.
• Read and analyze each article. (Use the Individual Article Analysis Worksheet )
• Compare all of the themes addressed in the articles. (Use the Article Analysis Matrix )
• Use your notes from the article analysis matrix to decide how to organize your literature review (make an outline).
• Write your literature review by discussing one theme at a time--how is this theme covered in the literature?
• Your literature review will also need an introduction and a conclusion. Some students like to start with the introduction, while others find it is easier to write the introduction after they have written the body of their literature review.
• Don't forget to include References at the end of your paper (and to cite them properly within the text)!
• Individual Article Analysis Worksheet Use this to analyze each of your articles. Focus on questions #4 - #6. These will help you identify the major themes/main ideas in each article you read.
• Article Analysis Matrix After completing the Individual Article Analysis Worksheet for each of your articles, use this Article Analysis Matrix to compile all of the information you have gathered. Use the Example Article Analysis Matrix below as a guide to get started.

Synthetic Writing

A literature review is not the same as a research paper. The point of a literature review is to synthesize the research of others without making a new argument or scholarly contribution. A literature review is also not an annotated bibliography. You should not write about each study you are reviewing in turn, but instead write synthetically to highlight the current state of the literature.

Key Points to Consider:

• The purpose of a literature review is to report the current state of the topic. Literature reviewed should be relatively recent, unless you are delving into the history of the topic.
• Discuss different themes within your literature review rather than individual articles. It will help if you pull information from 2-3 articles for each theme you discuss.
• All works cited should be both in the text of the literature review and the bibliography
• Avoid passive voice (ex: It was found that...); Use active voice ("Smith (2013) reported that...")
• Report what the literature says, not what you think

Writing Your Literature Review

The sites below offer a range of considerations and steps for writing the literature review.

• Learn How to Write a Review of Literature From the University of Wisconsin-Madison Writing Center.
• Literature Reviews From the UNC Chapel Hill Writing Center.
• Literature Review From the University of Houston-Victoria, Texas.
• The Literature Review: A Few Tips on Conducting It From the University of Toronto Health Sciences Writing Centre.
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Writing Literature Reviews

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Literature Review: an Overview for Graduate Students

Organize your notes on a Synthesis Matrix

As you read, you'll encounter various ideas, disagreements, methods, and perspectives which can be hard to organize in a meaningful way.

A synthesis matrix helps you record the main points of each source and document how sources relate to each other.

• Writing a Literature Review & Using a Synthesis Matrix (from NCSU Writing Center)

Sample literature review

• Sample literature review An example of a literature review in APA format from the Online Writing Lab (OWL) at Excelsior College. Includes annotations throughout the paper.
• Guide to Writing a Literature Review Noel Studio handout on writing a literature review.

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Ten Simple Rules for Writing a Literature Review

Marco pautasso.

1 Centre for Functional and Evolutionary Ecology (CEFE), CNRS, Montpellier, France

2 Centre for Biodiversity Synthesis and Analysis (CESAB), FRB, Aix-en-Provence, France

Literature reviews are in great demand in most scientific fields. Their need stems from the ever-increasing output of scientific publications [1] . For example, compared to 1991, in 2008 three, eight, and forty times more papers were indexed in Web of Science on malaria, obesity, and biodiversity, respectively [2] . Given such mountains of papers, scientists cannot be expected to examine in detail every single new paper relevant to their interests [3] . Thus, it is both advantageous and necessary to rely on regular summaries of the recent literature. Although recognition for scientists mainly comes from primary research, timely literature reviews can lead to new synthetic insights and are often widely read [4] . For such summaries to be useful, however, they need to be compiled in a professional way [5] .

When starting from scratch, reviewing the literature can require a titanic amount of work. That is why researchers who have spent their career working on a certain research issue are in a perfect position to review that literature. Some graduate schools are now offering courses in reviewing the literature, given that most research students start their project by producing an overview of what has already been done on their research issue [6] . However, it is likely that most scientists have not thought in detail about how to approach and carry out a literature review.

Reviewing the literature requires the ability to juggle multiple tasks, from finding and evaluating relevant material to synthesising information from various sources, from critical thinking to paraphrasing, evaluating, and citation skills [7] . In this contribution, I share ten simple rules I learned working on about 25 literature reviews as a PhD and postdoctoral student. Ideas and insights also come from discussions with coauthors and colleagues, as well as feedback from reviewers and editors.

Rule 1: Define a Topic and Audience

How to choose which topic to review? There are so many issues in contemporary science that you could spend a lifetime of attending conferences and reading the literature just pondering what to review. On the one hand, if you take several years to choose, several other people may have had the same idea in the meantime. On the other hand, only a well-considered topic is likely to lead to a brilliant literature review [8] . The topic must at least be:

• interesting to you (ideally, you should have come across a series of recent papers related to your line of work that call for a critical summary),
• an important aspect of the field (so that many readers will be interested in the review and there will be enough material to write it), and
• a well-defined issue (otherwise you could potentially include thousands of publications, which would make the review unhelpful).

Ideas for potential reviews may come from papers providing lists of key research questions to be answered [9] , but also from serendipitous moments during desultory reading and discussions. In addition to choosing your topic, you should also select a target audience. In many cases, the topic (e.g., web services in computational biology) will automatically define an audience (e.g., computational biologists), but that same topic may also be of interest to neighbouring fields (e.g., computer science, biology, etc.).

Rule 2: Search and Re-search the Literature

After having chosen your topic and audience, start by checking the literature and downloading relevant papers. Five pieces of advice here:

• keep track of the search items you use (so that your search can be replicated [10] ),
• keep a list of papers whose pdfs you cannot access immediately (so as to retrieve them later with alternative strategies),
• use a paper management system (e.g., Mendeley, Papers, Qiqqa, Sente),
• define early in the process some criteria for exclusion of irrelevant papers (these criteria can then be described in the review to help define its scope), and
• do not just look for research papers in the area you wish to review, but also seek previous reviews.

The chances are high that someone will already have published a literature review ( Figure 1 ), if not exactly on the issue you are planning to tackle, at least on a related topic. If there are already a few or several reviews of the literature on your issue, my advice is not to give up, but to carry on with your own literature review,

The bottom-right situation (many literature reviews but few research papers) is not just a theoretical situation; it applies, for example, to the study of the impacts of climate change on plant diseases, where there appear to be more literature reviews than research studies [33] .

• discussing in your review the approaches, limitations, and conclusions of past reviews,
• trying to find a new angle that has not been covered adequately in the previous reviews, and
• incorporating new material that has inevitably accumulated since their appearance.

When searching the literature for pertinent papers and reviews, the usual rules apply:

• be thorough,
• use different keywords and database sources (e.g., DBLP, Google Scholar, ISI Proceedings, JSTOR Search, Medline, Scopus, Web of Science), and
• look at who has cited past relevant papers and book chapters.

Rule 3: Take Notes While Reading

If you read the papers first, and only afterwards start writing the review, you will need a very good memory to remember who wrote what, and what your impressions and associations were while reading each single paper. My advice is, while reading, to start writing down interesting pieces of information, insights about how to organize the review, and thoughts on what to write. This way, by the time you have read the literature you selected, you will already have a rough draft of the review.

Of course, this draft will still need much rewriting, restructuring, and rethinking to obtain a text with a coherent argument [11] , but you will have avoided the danger posed by staring at a blank document. Be careful when taking notes to use quotation marks if you are provisionally copying verbatim from the literature. It is advisable then to reformulate such quotes with your own words in the final draft. It is important to be careful in noting the references already at this stage, so as to avoid misattributions. Using referencing software from the very beginning of your endeavour will save you time.

Rule 4: Choose the Type of Review You Wish to Write

After having taken notes while reading the literature, you will have a rough idea of the amount of material available for the review. This is probably a good time to decide whether to go for a mini- or a full review. Some journals are now favouring the publication of rather short reviews focusing on the last few years, with a limit on the number of words and citations. A mini-review is not necessarily a minor review: it may well attract more attention from busy readers, although it will inevitably simplify some issues and leave out some relevant material due to space limitations. A full review will have the advantage of more freedom to cover in detail the complexities of a particular scientific development, but may then be left in the pile of the very important papers “to be read” by readers with little time to spare for major monographs.

There is probably a continuum between mini- and full reviews. The same point applies to the dichotomy of descriptive vs. integrative reviews. While descriptive reviews focus on the methodology, findings, and interpretation of each reviewed study, integrative reviews attempt to find common ideas and concepts from the reviewed material [12] . A similar distinction exists between narrative and systematic reviews: while narrative reviews are qualitative, systematic reviews attempt to test a hypothesis based on the published evidence, which is gathered using a predefined protocol to reduce bias [13] , [14] . When systematic reviews analyse quantitative results in a quantitative way, they become meta-analyses. The choice between different review types will have to be made on a case-by-case basis, depending not just on the nature of the material found and the preferences of the target journal(s), but also on the time available to write the review and the number of coauthors [15] .

Rule 5: Keep the Review Focused, but Make It of Broad Interest

Whether your plan is to write a mini- or a full review, it is good advice to keep it focused 16 , 17 . Including material just for the sake of it can easily lead to reviews that are trying to do too many things at once. The need to keep a review focused can be problematic for interdisciplinary reviews, where the aim is to bridge the gap between fields [18] . If you are writing a review on, for example, how epidemiological approaches are used in modelling the spread of ideas, you may be inclined to include material from both parent fields, epidemiology and the study of cultural diffusion. This may be necessary to some extent, but in this case a focused review would only deal in detail with those studies at the interface between epidemiology and the spread of ideas.

While focus is an important feature of a successful review, this requirement has to be balanced with the need to make the review relevant to a broad audience. This square may be circled by discussing the wider implications of the reviewed topic for other disciplines.

Rule 6: Be Critical and Consistent

Reviewing the literature is not stamp collecting. A good review does not just summarize the literature, but discusses it critically, identifies methodological problems, and points out research gaps [19] . After having read a review of the literature, a reader should have a rough idea of:

• the major achievements in the reviewed field,
• the main areas of debate, and
• the outstanding research questions.

It is challenging to achieve a successful review on all these fronts. A solution can be to involve a set of complementary coauthors: some people are excellent at mapping what has been achieved, some others are very good at identifying dark clouds on the horizon, and some have instead a knack at predicting where solutions are going to come from. If your journal club has exactly this sort of team, then you should definitely write a review of the literature! In addition to critical thinking, a literature review needs consistency, for example in the choice of passive vs. active voice and present vs. past tense.

Rule 7: Find a Logical Structure

Like a well-baked cake, a good review has a number of telling features: it is worth the reader's time, timely, systematic, well written, focused, and critical. It also needs a good structure. With reviews, the usual subdivision of research papers into introduction, methods, results, and discussion does not work or is rarely used. However, a general introduction of the context and, toward the end, a recapitulation of the main points covered and take-home messages make sense also in the case of reviews. For systematic reviews, there is a trend towards including information about how the literature was searched (database, keywords, time limits) [20] .

How can you organize the flow of the main body of the review so that the reader will be drawn into and guided through it? It is generally helpful to draw a conceptual scheme of the review, e.g., with mind-mapping techniques. Such diagrams can help recognize a logical way to order and link the various sections of a review [21] . This is the case not just at the writing stage, but also for readers if the diagram is included in the review as a figure. A careful selection of diagrams and figures relevant to the reviewed topic can be very helpful to structure the text too [22] .

Rule 8: Make Use of Feedback

Reviews of the literature are normally peer-reviewed in the same way as research papers, and rightly so [23] . As a rule, incorporating feedback from reviewers greatly helps improve a review draft. Having read the review with a fresh mind, reviewers may spot inaccuracies, inconsistencies, and ambiguities that had not been noticed by the writers due to rereading the typescript too many times. It is however advisable to reread the draft one more time before submission, as a last-minute correction of typos, leaps, and muddled sentences may enable the reviewers to focus on providing advice on the content rather than the form.

Feedback is vital to writing a good review, and should be sought from a variety of colleagues, so as to obtain a diversity of views on the draft. This may lead in some cases to conflicting views on the merits of the paper, and on how to improve it, but such a situation is better than the absence of feedback. A diversity of feedback perspectives on a literature review can help identify where the consensus view stands in the landscape of the current scientific understanding of an issue [24] .

Rule 9: Include Your Own Relevant Research, but Be Objective

In many cases, reviewers of the literature will have published studies relevant to the review they are writing. This could create a conflict of interest: how can reviewers report objectively on their own work [25] ? Some scientists may be overly enthusiastic about what they have published, and thus risk giving too much importance to their own findings in the review. However, bias could also occur in the other direction: some scientists may be unduly dismissive of their own achievements, so that they will tend to downplay their contribution (if any) to a field when reviewing it.

In general, a review of the literature should neither be a public relations brochure nor an exercise in competitive self-denial. If a reviewer is up to the job of producing a well-organized and methodical review, which flows well and provides a service to the readership, then it should be possible to be objective in reviewing one's own relevant findings. In reviews written by multiple authors, this may be achieved by assigning the review of the results of a coauthor to different coauthors.

Rule 10: Be Up-to-Date, but Do Not Forget Older Studies

Given the progressive acceleration in the publication of scientific papers, today's reviews of the literature need awareness not just of the overall direction and achievements of a field of inquiry, but also of the latest studies, so as not to become out-of-date before they have been published. Ideally, a literature review should not identify as a major research gap an issue that has just been addressed in a series of papers in press (the same applies, of course, to older, overlooked studies (“sleeping beauties” [26] )). This implies that literature reviewers would do well to keep an eye on electronic lists of papers in press, given that it can take months before these appear in scientific databases. Some reviews declare that they have scanned the literature up to a certain point in time, but given that peer review can be a rather lengthy process, a full search for newly appeared literature at the revision stage may be worthwhile. Assessing the contribution of papers that have just appeared is particularly challenging, because there is little perspective with which to gauge their significance and impact on further research and society.

Inevitably, new papers on the reviewed topic (including independently written literature reviews) will appear from all quarters after the review has been published, so that there may soon be the need for an updated review. But this is the nature of science [27] – [32] . I wish everybody good luck with writing a review of the literature.

Acknowledgments

Many thanks to M. Barbosa, K. Dehnen-Schmutz, T. Döring, D. Fontaneto, M. Garbelotto, O. Holdenrieder, M. Jeger, D. Lonsdale, A. MacLeod, P. Mills, M. Moslonka-Lefebvre, G. Stancanelli, P. Weisberg, and X. Xu for insights and discussions, and to P. Bourne, T. Matoni, and D. Smith for helpful comments on a previous draft.

Funding Statement

This work was funded by the French Foundation for Research on Biodiversity (FRB) through its Centre for Synthesis and Analysis of Biodiversity data (CESAB), as part of the NETSEED research project. The funders had no role in the preparation of the manuscript.

Conducting a Literature Review

• Literature Review
• Developing a Topic
• Planning Your Literature Review
• Developing a Search Strategy
• Managing Citations
• Critical Appraisal Tools
• Writing a Literature Review

Developing a Research Question

One of the hardest parts of a literature review is to develop a good research question.  You don't want a research question that is so broad it encompasses too many research areas, and can't be reasonably answered. 

Defining your topic may require an initial review of literature on your topic to get a sense of the scope about your topic.   Select a topic of interest, and do a preliminary search to see what kinds of research is being done and what is trending in that topic area.  This will give you a better sense of the topic, and help you focus your research question

In specifying your topic or research question, you should think about setting appropriate limitations on the research you are seeking. Limiting, for example, by time, personnel, gender, age, location, nationality etc. results in a more focused and meaningful topic. 

You may start with a general question:  

Why did the chicken cross the road? 

This question is so general that you could be gathering relevant research for days. 

A more precise research question might be:  

What are some of the environmental factors that occurred in New Jersey between January and June 2021 that would cause a chicken to cross Route 3?  

This research question is specific about a number of variables like time, geography, etc.  

Some Questions to Ask

Some questions to think about as you develop your literature review:

• What is known about the subject?
• Are there any gaps in the knowledge of the subject?
• Have areas of further study been identified by other researchers that you may want to consider?
• Who are the significant research personalities in this area?
• Is there consensus about the topic?
• What aspects have generated significant debate on the topic?
• What methods or problems were identified by others studying in the field and how might they impact your research?
• What is the most productive methodology for your research based on the literature you have reviewed?
• What is the current status of research in this area?
• What sources of information or data were identified that might be useful to you?
• How detailed? Will it be a review of ALL relevant material or will the scope be limited to more recent material, e.g., the last five years.
• Are you focusing on methodological approaches; on theoretical issues; on qualitative or quantitative research?
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A systematic review on education outside the classroom: lessons for science eoc practices.

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O’Neill, D.; Kelly, R.; McCormack, O.; Azevedo, N.H. A Systematic Review on Education Outside the Classroom: Lessons for Science EOC Practices. Sustainability 2024 , 16 , 5346. https://doi.org/10.3390/su16135346

O’Neill D, Kelly R, McCormack O, Azevedo NH. A Systematic Review on Education Outside the Classroom: Lessons for Science EOC Practices. Sustainability . 2024; 16(13):5346. https://doi.org/10.3390/su16135346

O’Neill, Deirdre, Regina Kelly, Orla McCormack, and Nathália Helena Azevedo. 2024. "A Systematic Review on Education Outside the Classroom: Lessons for Science EOC Practices" Sustainability 16, no. 13: 5346. https://doi.org/10.3390/su16135346

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Inverted Classroom Teaching of Physiology in Basic Medical Education: Bibliometric Visual Analysis

Affiliations.

• 1 School of Basic Medicine and Public Health, Jinan University, Guangzhou, China.
• 2 Division of Life Science, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, HKSAR, China.
• 3 Gies College of Business, University of Illinois Urbana-Champaign, Urbana-Champaign, IL, United States.
• 4 School of Education, South China Normal University, Guangzhou, China.
• PMID: 38940629
• DOI: 10.2196/52224

Background: Over the last decade, there has been growing interest in inverted classroom teaching (ICT) and its various forms within the education sector. Physiology is a core course that bridges basic and clinical medicine, and ICT in physiology has been sporadically practiced to different extents globally. However, students' and teachers' responses and feedback to ICT in physiology are diverse, and the effectiveness of a modified ICT model integrated into regular teaching practice in physiology courses is difficult to assess objectively and quantitatively.

Objective: This study aimed to explore the current status and development direction of ICT in physiology in basic medical education using bibliometric visual analysis of the related literature.

Methods: A bibliometric analysis of the ICT-related literature in physiology published between 2000 and 2023 was performed using CiteSpace, a bibliometric visualization tool, based on the Web of Science database. Moreover, an in-depth review was performed to summarize the application of ICT in physiology courses worldwide, along with identification of research hot spots and development trends.

Results: A total of 42 studies were included for this bibliometric analysis, with the year 2013 marking the commencement of the field. University staff and doctors working at affiliated hospitals represent the core authors of this field, with several research teams forming cooperative relationships and developing research networks. The development of ICT in physiology could be divided into several stages: the introduction stage (2013-2014), extensive practice stage (2015-2019), and modification and growth stage (2020-2023). Gopalan C is the author with the highest citation count of 5 cited publications and has published 14 relevant papers since 2016, with a significant surge from 2019 to 2022. Author collaboration is generally limited in this field, and most academic work has been conducted in independent teams, with minimal cross-team communication. Authors from the United States published the highest number of papers related to ICT in physiology (18 in total, accounting for over 43% of the total papers), and their intermediary centrality was 0.24, indicating strong connections both within the country and internationally. Chinese authors ranked second, publishing 8 papers in the field, although their intermediary centrality was only 0.02, suggesting limited international influence and lower overall research quality. The topics of ICT in physiology research have been multifaceted, covering active learning, autonomous learning, student performance, teaching effect, blended teaching, and others.

Conclusions: This bibliometric analysis and literature review provides a comprehensive overview of the history, development process, and future direction of the field of ICT in physiology. These findings can help to strengthen academic exchange and cooperation internationally, while promoting the diversification and effectiveness of ICT in physiology through building academic communities to jointly train emerging medical talents.

Keywords: academic; academic community; bibliometric; bibliometric analysis; bibliometric visual analysis; classroom-based; evolution trend; flipped classroom; flipped classroom teaching; frontier progress; hot topics; inverted classroom; medical education; physiology; scientific knowledge map; teaching method; visual analysis; visualization tool.

© Zonglin He, Botao Zhou, Haixiao Feng, Jian Bai, Yuechun Wang. Originally published in JMIR Medical Education (https://mededu.jmir.org).

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Digital technologies to support young children with special needs in early childhood education and care

• Education and skills
• Student performance (PISA)
• Teachers and educators
• Education access, participation and progression
• Education equity
• Digital education
• Early childhood education and care

Cite this content as:

This review examines the current literature on the use of digital technologies to support young children with special needs in early childhood education and care (ECEC). It identifies four key areas of focus, which relate to understanding and articulating the purpose and focus for integrating assistive technologies (ATs) in ECEC; activating and integrating expertise in ECEC; developing an engaged community of experience and practice; and promoting and supporting quality AT design. Foundations for further developments are evident across the research literature and the review derives recommendations to provide direction for ECEC policy makers and staff, educational institutions and allied support networks for achieving the promise of AT for children with special needs in ECEC.

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