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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.

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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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7th edition table of contents

• Front Matter
• 1. Scholarly Writing and Publishing Principles
• 2. Paper Elements and Format
• 3. Journal Article Reporting Standards
• 4. Writing Style and Grammar
• 5. Bias-Free Language Guidelines
• 6. Mechanics of Style
• 7. Tables and Figures
• 8. Works Credited in the Text
• 9. Reference List
• 10. Reference Examples
• 11. Legal References
• 12. Publication Process
• Back Matter

List of Tables and Figures

Editorial Staff and Contributors

Acknowledgments

Introduction (PDF, 94KB)

Types of Articles and Papers

1.1 Quantitative Articles 1.2 Qualitative Articles 1.3 Mixed Methods Articles 1.4 Replication Articles 1.5 Quantitative and Qualitative Meta-Analyses 1.6 Literature Review Articles 1.7 Theoretical Articles 1.8 Methodological Articles 1.9 Other Types of Articles 1.10 Student Papers, Dissertations, and Theses

Ethical, legal, and professional standards in publishing

Ensuring the Accuracy of Scientific Findings

1.11 Planning for Ethical Compliance 1.12 Ethical and Accurate Reporting of Research Results 1.13 Errors, Corrections, and Retractions After Publication 1.14 Data Retention and Sharing 1.15 Additional Data-Sharing Considerations for Qualitative Research 1.16 Duplicate and Piecemeal Publication of Data 1.17 Implications of Plagiarism and Self-Plagiarism

Protecting the Rights and Welfare of Research Participants and Subjects

1.18 Rights and Welfare of Research Participants and Subjects 1.19 Protecting Confidentiality 1.20 Conflict of Interest

Protecting Intellectual Property Rights

1.21 Publication Credit 1.22 Order of Authors 1.23 Authors’ Intellectual Property Rights During Manuscript Review 1.24 Authors’ Copyright on Unpublished Manuscripts 1.25 Ethical Compliance Checklist

Required Elements

2.1 Professional Paper Required Elements 2.2 Student Paper Required Elements

Paper Elements

2.3 Title Page 2.4 Title 2.5 Author Name (Byline) 2.6 Author Affiliation 2.7 Author Note 2.8 Running Head 2.9 Abstract 2.10 Keywords 2.11 Text (Body) 2.12 Reference List 2.13 Footnotes 2.14 Appendices 2.15 Supplemental Materials

2.16 Importance of Format 2.17 Order of Pages 2.18 Page Header 2.19 Font 2.20 Special Characters 2.21 Line Spacing 2.22 Margins 2.23 Paragraph Alignment 2.24 Paragraph Indentation 2.25 Paper Length

Organization

2.26 Principles of Organization 2.27 Heading Levels 2.28 Section Labels

Sample papers

Overview of Reporting Standards

3.1 Application of the Principles of JARS 3.2 Terminology Used in JARS

Common Reporting Standards Across Research Designs

3.3 Abstract Standards 3.4 Introduction Standards

Reporting Standards for Quantitative Research

3.5 Basic Expectations for Quantitative Research Reporting 3.6 Quantitative Method Standards 3.7 Quantitative Results Standards 3.8 Quantitative Discussion Standards 3.9 Additional Reporting Standards for Typical Experimental and Nonexperimental Studies 3.10 Reporting Standards for Special Designs 3.11 Standards for Analytic Approaches 3.12 Quantitative Meta-Analysis Standards

Reporting Standards for Qualitative Research

3.13 Basic Expectations for Qualitative Research Reporting 3.14 Qualitative Method Standards 3.15 Qualitative Findings or Results Standards 3.16 Qualitative Discussion Standards 3.17 Qualitative Meta-Analysis Standards

Reporting Standards for Mixed Methods Research

3.18 Basic Expectations for Mixed Methods Research Reporting

Effective scholarly writing

Continuity and Flow

4.1 Importance of Continuity and Flow 4.2 Transitions 4.3 Noun Strings

Conciseness and Clarity

4.4 Importance of Conciseness and Clarity 4.5 Wordiness and Redundancy 4.6 Sentence and Paragraph Length 4.7 Tone 4.8 Contractions and Colloquialisms 4.9 Jargon 4.10 Logical Comparisons 4.11 Anthropomorphism

Grammar and usage

4.12 Verb Tense 4.13 Active and Passive Voice 4.14 Mood 4.15 Subject and Verb Agreement

4.16 First- Versus Third-Person Pronouns 4.17 Editorial “We” 4.18 Singular “They” 4.19 Pronouns for People and Animals (“Who” vs. “That”) 4.20 Pronouns as Subjects and Objects (“Who” vs. “Whom”) 4.21 Pronouns in Restrictive and Nonrestrictive Clauses (“That” vs. “Which”)

Sentence Construction

4.22 Subordinate Conjunctions 4.23 Misplaced and Dangling Modifiers 4.24 Parallel Construction

Strategies to Improve Your Writing

4.25 Reading to Learn Through Example 4.26 Writing From an Outline 4.27 Rereading the Draft 4.28 Seeking Help From Colleagues 4.29 Working With Copyeditors and Writing Centers 4.30 Revising a Paper

General Guidelines for Reducing Bias

5.1 Describe at the Appropriate Level of Specificity 5.2 Be Sensitive to Labels

Reducing Bias by Topic

5.3 Age 5.4 Disability 5.5 Gender 5.6 Participation in Research 5.7 Racial and Ethnic Identity 5.8 Sexual Orientation 5.9 Socioeconomic Status 5.10 Intersectionality

Punctuation

6.1 Spacing After Punctuation Marks 6.2 Period 6.3 Comma 6.4 Semicolon 6.5 Colon 6.6 Dash 6.7 Quotation Marks 6.8 Parentheses 6.9 Square Brackets 6.10 Slash

6.11 Preferred Spelling 6.12 Hyphenation

Capitalization

6.13 Words Beginning a Sentence 6.14 Proper Nouns and Trade Names 6.15 Job Titles and Positions 6.16 Diseases, Disorders, Therapies, Theories, and Related Terms 6.17 Titles of Works and Headings Within Works 6.18 Titles of Tests and Measures 6.19 Nouns Followed by Numerals or Letters 6.20 Names of Conditions or Groups in an Experiment 6.21 Names of Factors, Variables, and Effects

6.22 Use of Italics 6.23 Reverse Italics

Abbreviations

6.24 Use of Abbreviations 6.25 Definition of Abbreviations 6.26 Format of Abbreviations 6.27 Unit of Measurement Abbreviations 6.28 Time Abbreviations 6.29 Latin Abbreviations 6.30 Chemical Compound Abbreviations 6.31 Gene and Protein Name Abbreviations

6.32 Numbers Expressed in Numerals 6.33 Numbers Expressed in Words 6.34 Combining Numerals and Words to Express Numbers 6.35 Ordinal Numbers 6.36 Decimal Fractions 6.37 Roman Numerals 6.38 Commas in Numbers 6.39 Plurals of Numbers

Statistical and Mathematical Copy

6.40 Selecting Effective Presentation 6.41 References for Statistics 6.42 Formulas 6.43 Statistics in Text 6.44 Statistical Symbols and Abbreviations 6.45 Spacing, Alignment, and Punctuation for Statistics

Presentation of Equations

6.46 Equations in Text 6.47 Displayed Equations 6.48 Preparing Statistical and Mathematical Copy for Publication

6.49 List Guidelines 6.50 Lettered Lists 6.51 Numbered Lists 6.52 Bulleted Lists

General Guidelines for Tables and Figures

7.1 Purpose of Tables and Figures 7.2 Design and Preparation of Tables and Figures 7.3 Graphical Versus Textual Presentation 7.4 Formatting Tables and Figures 7.5 Referring to Tables and Figures in the Text 7.6 Placement of Tables and Figures 7.7 Reprinting or Adapting Tables and Figures

7.8 Principles of Table Construction 7.9 Table Components 7.10 Table Numbers 7.11 Table Titles 7.12 Table Headings 7.13 Table Body 7.14 Table Notes 7.15 Standard Abbreviations in Tables and Figures 7.16 Confidence Intervals in Tables 7.17 Table Borders and Shading 7.18 Long or Wide Tables 7.19 Relation Between Tables 7.20 Table Checklist 7.21 Sample Tables

Sample tables

7.22 Principles of Figure Construction 7.23 Figure Components 7.24 Figure Numbers 7.25 Figure Titles 7.26 Figure Images 7.27 Figure Legends 7.28 Figure Notes 7.29 Relation Between Figures 7.30 Photographs 7.31 Considerations for Electrophysiological, Radiological, Genetic, and Other Biological Data 7.32 Electrophysiological Data 7.33 Radiological (Imaging) Data 7.34 Genetic Data 7.35 Figure Checklist 7.36 Sample Figures

Sample figures

General Guidelines for Citation

8.1 Appropriate Level of Citation 8.2 Plagiarism 8.3 Self-Plagiarism 8.4 Correspondence Between Reference List and Text 8.5 Use of the Published Version or Archival Version 8.6 Primary and Secondary Sources

Works Requiring Special Approaches to Citation

8.7 Interviews 8.8 Classroom or Intranet Sources 8.9 Personal Communications

In-Text Citations

8.10 Author–Date Citation System 8.11 Parenthetical and Narrative Citations 8.12 Citing Multiple Works 8.13 Citing Specific Parts of a Source 8.14 Unknown or Anonymous Author 8.15 Translated, Reprinted, Republished, and Reissued Dates 8,16 Omitting the Year in Repeated Narrative Citations 8.17 Number of Authors to Include in In-Text Citations 8.18 Avoiding Ambiguity in In-Text Citations 8.19 Works With the Same Author and Same Date 8.20 Authors With the Same Surname 8.21 Abbreviating Group Authors 8.22 General Mentions of Websites, Periodicals, and Common Software and Apps

Paraphrases and Quotations

8.23 Principles of Paraphrasing 8.24 Long Paraphrases 8.25 Principles of Direct Quotation 8.26 Short Quotations (Fewer Than 40 Words) 8.27 Block Quotations (40 Words or More) 8.28 Direct Quotation of Material Without Page Numbers 8.29 Accuracy of Quotations 8.30 Changes to a Quotation Requiring No Explanation 8.31 Changes to a Quotation Requiring Explanation 8.32 Quotations That Contain Citations to Other Works 8.33 Quotations That Contain Material Already in Quotation Marks 8.34 Permission to Reprint or Adapt Lengthy Quotations 8.35 Epigraphs 8.36 Quotations From Research Participants

Reference Categories

9.1 Determining the Reference Category 9.2 Using the Webpages and Websites Reference Category 9.3 Online and Print References

Principles of Reference List Entries

9.4 Four Elements of a Reference 9.5 Punctuation Within Reference List Entries 9.6 Accuracy and Consistency in References

Reference elements

9.7 Definition of Author 9.8 Format of the Author Element 9.9 Spelling and Capitalization of Author Names 9.10 Identification of Specialized Roles 9.11 Group Authors 9.12 No Author

9.13 Definition of Date 9.14 Format of the Date Element 9.15 Updated or Reviewed Online Works 9.16 Retrieval Dates 9.17 No Date

9.18 Definition of Title 9.19 Format of the Title Element 9.20 Series and Multivolume Works 9.21 Bracketed Descriptions 9.22 No Title

9.23 Definition of Source 9.24 Format of the Source Element 9.25 Periodical Sources 9.26 Online Periodicals With Missing Information 9.27 Article Numbers 9.28 Edited Book Chapter and Reference Work Entry Sources 9.29 Publisher Sources 9.30 Database and Archive Sources 9.31 Works With Specific Locations 9.32 Social Media Sources 9.33 Website Sources 9.34 When to Include DOIs and URLs 9.35 Format of DOIs and URLs 9.36 DOI or URL Shorteners 9.37 No Source

Reference Variations

9.38 Works in Another Language 9.39 Translated Works 9.40 Reprinted Works 9.41 Republished or Reissued Works 9.42 Religious and Classical Works

Reference List Format and Order

9.43 Format of the Reference List 9.44 Order of Works in the Reference List 9.45 Order of Surname and Given Name 9.46 Order of Multiple Works by the Same First Author 9.47 Order of Works With the Same Author and Same Date 9.48 Order of Works by First Authors With the Same Surname 9.49 Order of Works With No Author or an Anonymous Author 9.50 Abbreviations in References 9.51 Annotated Bibliographies 9.52 References Included in a Meta-Analysis

Author Variations

Date Variations

Title Variations

Source Variations

Textual Works

10.1 Periodicals 10.2 Books and Reference Works 10.3 Edited Book Chapters and Entries in Reference Works 10.4 Reports and Gray Literature 10.5 Conference Sessions and Presentations 10.6 Dissertations and Theses 10.7 Reviews 10.8 Unpublished Works and Informally Published Works

Data Sets, Software, and Tests

10.9 Data Sets 10.10 Computer Software, Mobile Apps, Apparatuses, and Equipment 10.11 Tests, Scales, and Inventories

Audiovisual Media

10.12 Audiovisual Works 10.13 Audio Works 10.14 Visual Works

Online Media

10.15 Social Media 10.16 Webpages and Websites

General Guidelines for Legal References

11.1 APA Style References Versus Legal References 11.2 General Forms 11.3 In-Text Citations of Legal Materials

Legal Reference Examples

11.4 Cases or Court Decisions 11.5 Statutes (Laws and Acts) 11.6 Legislative Materials 11.7 Administrative and Executive Materials 11.8 Patents 11.9 Constitutions and Charters 11.10 Treaties and International Conventions

Preparing for Publication

12.1 Adapting a Dissertation or Thesis Into a Journal Article 12.2 Selecting a Journal for Publication 12.3 Prioritizing Potential Journals 12.4 Avoiding Predatory Journals

Understanding the Editorial Publication Process

12.5 Editorial Publication Process 12.6 Role of the Editors 12.7 Peer Review Process 12.8 Manuscript Decisions

Manuscript Preparation

12.9 Preparing the Manuscript for Submission 12.10 Using an Online Submission Portal 12.11 Writing a Cover Letter 12.12 Corresponding During Publication 12.13 Certifying Ethical Requirements

Copyright and Permission Guidelines

12.14 General Guidelines for Reprinting or Adapting Materials 12.15 Materials That Require Copyright Attribution 12.16 Copyright Status 12.17 Permission and Fair Use 12.18 Copyright Attribution Formats

During and After Publication

12.19 Article Proofs 12.20 Published Article Copyright Policies 12.21 Open Access Deposit Policies 12.22 Writing a Correction Notice 12.23 Sharing Your Article Online 12.24 Promoting Your Article

Credits for Adapted Tables, Figures, and Papers

• UConn Library
• Literature Review: The What, Why and How-to Guide
• Introduction

Literature Review: The What, Why and How-to Guide — Introduction

• Getting Started
• How to Pick a Topic
• Strategies to Find Sources
• Evaluating Sources & Lit. Reviews
• Tips for Writing Literature Reviews
• Writing Literature Review: Useful Sites
• Citation Resources
• Other Academic Writings

What are Literature Reviews?

So, what is a literature review? "A literature review is an account of what has been published on a topic by accredited scholars and researchers. In writing the literature review, your purpose is to convey to your reader what knowledge and ideas have been established on a topic, and what their strengths and weaknesses are. As a piece of writing, the literature review must be defined by a guiding concept (e.g., your research objective, the problem or issue you are discussing, or your argumentative thesis). It is not just a descriptive list of the material available, or a set of summaries." Taylor, D.  The literature review: A few tips on conducting it . University of Toronto Health Sciences Writing Centre.

Goals of Literature Reviews

What are the goals of creating a Literature Review?  A literature could be written to accomplish different aims:

• To develop a theory or evaluate an existing theory
• To summarize the historical or existing state of a research topic
• Identify a problem in a field of research 

Baumeister, R. F., & Leary, M. R. (1997). Writing narrative literature reviews .  Review of General Psychology , 1 (3), 311-320.

What kinds of sources require a Literature Review?

• A research paper assigned in a course
• A thesis or dissertation
• A grant proposal
• An article intended for publication in a journal

All these instances require you to collect what has been written about your research topic so that you can demonstrate how your own research sheds new light on the topic.

Types of Literature Reviews

What kinds of literature reviews are written?

Narrative review: The purpose of this type of review is to describe the current state of the research on a specific topic/research and to offer a critical analysis of the literature reviewed. Studies are grouped by research/theoretical categories, and themes and trends, strengths and weakness, and gaps are identified. The review ends with a conclusion section which summarizes the findings regarding the state of the research of the specific study, the gaps identify and if applicable, explains how the author's research will address gaps identify in the review and expand the knowledge on the topic reviewed.

• Example : Predictors and Outcomes of U.S. Quality Maternity Leave: A Review and Conceptual Framework:  10.1177/08948453211037398  

Systematic review : "The authors of a systematic review use a specific procedure to search the research literature, select the studies to include in their review, and critically evaluate the studies they find." (p. 139). Nelson, L. K. (2013). Research in Communication Sciences and Disorders . Plural Publishing.

• Example : The effect of leave policies on increasing fertility: a systematic review:  10.1057/s41599-022-01270-w

Meta-analysis : "Meta-analysis is a method of reviewing research findings in a quantitative fashion by transforming the data from individual studies into what is called an effect size and then pooling and analyzing this information. The basic goal in meta-analysis is to explain why different outcomes have occurred in different studies." (p. 197). Roberts, M. C., & Ilardi, S. S. (2003). Handbook of Research Methods in Clinical Psychology . Blackwell Publishing.

• Example : Employment Instability and Fertility in Europe: A Meta-Analysis:  10.1215/00703370-9164737

Meta-synthesis : "Qualitative meta-synthesis is a type of qualitative study that uses as data the findings from other qualitative studies linked by the same or related topic." (p.312). Zimmer, L. (2006). Qualitative meta-synthesis: A question of dialoguing with texts .  Journal of Advanced Nursing , 53 (3), 311-318.

• Example : Women’s perspectives on career successes and barriers: A qualitative meta-synthesis:  10.1177/05390184221113735

Literature Reviews in the Health Sciences

• UConn Health subject guide on systematic reviews Explanation of the different review types used in health sciences literature as well as tools to help you find the right review type
• << Previous: Getting Started
• Next: How to Pick a Topic >>
• Last Updated: Sep 21, 2022 2:16 PM
• URL: https://guides.lib.uconn.edu/literaturereview

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The Research Proposal

83 Components of the Literature Review

Krathwohl (2005) suggests and describes a variety of components to include in a research proposal.  The following sections present these components in a suggested template for you to follow in the preparation of your research proposal.

Introduction

The introduction sets the tone for what follows in your research proposal – treat it as the initial pitch of your idea.  After reading the introduction your reader should:

• Understand what it is you want to do;
• Have a sense of your passion for the topic;
• Be excited about the study´s possible outcomes.

As you begin writing your research proposal it is helpful to think of the introduction as a narrative of what it is you want to do, written in one to three paragraphs.  Within those one to three paragraphs, it is important to briefly answer the following questions:

• What is the central research problem?
• How is the topic of your research proposal related to the problem?
• What methods will you utilize to analyze the research problem?
• Why is it important to undertake this research? What is the significance of your proposed research?  Why are the outcomes of your proposed research important, and to whom or to what are they important?

Note : You may be asked by your instructor to include an abstract with your research proposal.  In such cases, an abstract should provide an overview of what it is you plan to study, your main research question, a brief explanation of your methods to answer the research question, and your expected findings. All of this information must be carefully crafted in 150 to 250 words.  A word of advice is to save the writing of your abstract until the very end of your research proposal preparation.  If you are asked to provide an abstract, you should include 5-7 key words that are of most relevance to your study. List these in order of relevance.

Background and significance

The purpose of this section is to explain the context of your proposal and to describe, in detail, why it is important to undertake this research. Assume that the person or people who will read your research proposal know nothing or very little about the research problem.  While you do not need to include all knowledge you have learned about your topic in this section, it is important to ensure that you include the most relevant material that will help to explain the goals of your research.

While there are no hard and fast rules, you should attempt to address some or all of the following key points:

• State the research problem and provide a more thorough explanation about the purpose of the study than what you stated in the introduction.
• Present the rationale for the proposed research study. Clearly indicate why this research is worth doing.  Answer the “so what?” question.
• Describe the major issues or problems to be addressed by your research. Do not forget to explain how and in what ways your proposed research builds upon previous related research.
• Explain how you plan to go about conducting your research.
• Clearly identify the key or most relevant sources of research you intend to use and explain how they will contribute to your analysis of the topic.
• Set the boundaries of your proposed research, in order to provide a clear focus. Where appropriate, state not only what you will study, but what will be excluded from your study.
• Provide clear definitions of key concepts and terms. As key concepts and terms often have numerous definitions, make sure you state which definition you will be utilizing in your research.

Literature Review

This is the most time-consuming aspect in the preparation of your research proposal and it is a key component of the research proposal. As described in Chapter 5 , the literature review provides the background to your study and demonstrates the significance of the proposed research. Specifically, it is a review and synthesis of prior research that is related to the problem you are setting forth to investigate.  Essentially, your goal in the literature review is to place your research study within the larger whole of what has been studied in the past, while demonstrating to your reader that your work is original, innovative, and adds to the larger whole.

As the literature review is information dense, it is essential that this section be intelligently structured to enable your reader to grasp the key arguments underpinning your study. However, this can be easier to state and harder to do, simply due to the fact there is usually a plethora of related research to sift through. Consequently, a good strategy for writing the literature review is to break the literature into conceptual categories or themes, rather than attempting to describe various groups of literature you reviewed.  Chapter V, “ The Literature Review ,” describes a variety of methods to help you organize the themes.

Here are some suggestions on how to approach the writing of your literature review:

• Think about what questions other researchers have asked, what methods they used, what they found, and what they recommended based upon their findings.
• Do not be afraid to challenge previous related research findings and/or conclusions.
• Assess what you believe to be missing from previous research and explain how your research fills in this gap and/or extends previous research

It is important to note that a significant challenge related to undertaking a literature review is knowing when to stop.  As such, it is important to know how to know when you have uncovered the key conceptual categories underlying your research topic.  Generally, when you start to see repetition in the conclusions or recommendations, you can have confidence that you have covered all of the significant conceptual categories in your literature review.  However, it is also important to acknowledge that researchers often find themselves returning to the literature as they collect and analyze their data.  For example, an unexpected finding may develop as one collects and/or analyzes the data and it is important to take the time to step back and review the literature again, to ensure that no other researchers have found a similar finding.  This may include looking to research outside your field.

This situation occurred with one of the authors of this textbook´s research related to community resilience.  During the interviews, the researchers heard many participants discuss individual resilience factors and how they believed these individual factors helped make the community more resilient, overall.  Sheppard and Williams (2016) had not discovered these individual factors in their original literature review on community and environmental resilience. However, when they returned to the literature to search for individual resilience factors, they discovered a small body of literature in the child and youth psychology field. Consequently, Sheppard and Williams had to go back and add a new section to their literature review on individual resilience factors. Interestingly, their research appeared to be the first research to link individual resilience factors with community resilience factors.

Research design and methods

The objective of this section of the research proposal is to convince the reader that your overall research design and methods of analysis will enable you to solve the research problem you have identified and also enable you to accurately and effectively interpret the results of your research. Consequently, it is critical that the research design and methods section is well-written, clear, and logically organized.  This demonstrates to your reader that you know what you are going to do and how you are going to do it.  Overall, you want to leave your reader feeling confident that you have what it takes to get this research study completed in a timely fashion.

Essentially, this section of the research proposal should be clearly tied to the specific objectives of your study; however, it is also important to draw upon and include examples from the literature review that relate to your design and intended methods.  In other words, you must clearly demonstrate how your study utilizes and builds upon past studies, as it relates to the research design and intended methods.  For example, what methods have been used by other researchers in similar studies?

While it is important to consider the methods that other researchers have employed, it is equally important, if not more so, to consider what methods have not been employed but could be.  Remember, the methods section is not simply a list of tasks to be undertaken. It is also an argument as to why and how the tasks you have outlined will help you investigate the research problem and answer your research question(s).

Tips for writing the research design and methods section:

• Specify the methodological approaches you intend to employ to obtain information and the techniques you will use to analyze the data.
• Specify the research operations you will undertake and he way you will interpret the results of those operations in relation to the research problem.
• Go beyond stating what you hope to achieve through the methods you have chosen. State how you will actually do the methods (i.e. coding interview text, running regression analysis, etc.).
• Anticipate and acknowledge any potential barriers you may encounter when undertaking your research and describe how you will address these barriers.
• Explain where you believe you will find challenges related to data collection, including access to participants and information.

Preliminary suppositions and implications

The purpose of this section is to argue how and in what ways you anticipate that your research will refine, revise, or extend existing knowledge in the area of your study. Depending upon the aims and objectives of your study, you should also discuss how your anticipated findings may impact future research.  For example, is it possible that your research may lead to a new policy, new theoretical understanding, or a new method for analyzing data?  How might your study influence future studies?  What might your study mean for future practitioners working in the field?  Who or what may benefit from your study?  How might your study contribute to social, economic, environmental issues?  While it is important to think about and discuss possibilities such as these, it is equally important to be realistic in stating your anticipated findings.  In other words, you do not want to delve into idle speculation.  Rather, the purpose here is to reflect upon gaps in the current body of literature and to describe how and in what ways you anticipate your research will begin to fill in some or all of those gaps.

The conclusion reiterates the importance and significance of your research proposal and it provides a brief summary of the entire proposed study.  Essentially, this section should only be one or two paragraphs in length. Here is a potential outline for your conclusion:

• Discuss why the study should be done. Specifically discuss how you expect your study will advance existing knowledge and how your study is unique.
• Explain the specific purpose of the study and the research questions that the study will answer.
• Explain why the research design and methods chosen for this study are appropriate, and why other design and methods were not chosen.
• State the potential implications you expect to emerge from your proposed study,
• Provide a sense of how your study fits within the broader scholarship currently in existence related to the research problem.

As with any scholarly research paper, you must cite the sources you used in composing your research proposal.  In a research proposal, this can take two forms: a reference list or a bibliography.  A reference list does what the name suggests, it lists the literature you referenced in the body of your research proposal.  All references in the reference list, must appear in the body of the research proposal.  Remember, it is not acceptable to say “as cited in …”  As a researcher you must always go to the original source and check it for yourself.  Many errors are made in referencing, even by top researchers, and so it is important not to perpetuate an error made by someone else. While this can be time consuming, it is the proper way to undertake a literature review.

In contrast, a bibliography , is a list of everything you used or cited in your research proposal, with additional citations to any key sources relevant to understanding the research problem.  In other words, sources cited in your bibliography may not necessarily appear in the body of your research proposal.  Make sure you check with your instructor to see which of the two you are expected to produce.

Overall, your list of citations should be a testament to the fact that you have done a sufficient level of preliminary research to ensure that your project will complement, but not duplicate, previous research efforts. For social sciences, the reference list or bibliography should be prepared in American Psychological Association (APA) referencing format. Usually, the reference list (or bibliography) is not included in the word count of the research proposal. Again, make sure you check with your instructor to confirm.

An Introduction to Research Methods in Sociology Copyright © 2019 by Valerie A. Sheppard is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License , except where otherwise noted.

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• Association between COVID-19 vaccination and menstruation: a state of the science review
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• http://orcid.org/0000-0001-5999-9101 Laura A Payne 1 , 2 ,
• Lauren A Wise 3 ,
• Amelia K Wesselink 3 ,
• Siwen Wang 4 ,
• Stacey A Missmer 2 , 4 , 5 ,
• Alison Edelman 6
• 1 McLean Hospital , Belmont , Massachusetts , USA
• 2 Harvard Medical School , Boston , Massachusetts , USA
• 3 Boston University School of Public Health , Boston , Massachusetts , USA
• 4 Harvard T H Chan School of Public Health , Boston , Massachusetts , USA
• 5 Michigan State University , East Lansing , Michigan , USA
• 6 Oregon Health & Science University , Portland , Oregon , USA
• Correspondence to Dr Laura A Payne, McLean Hospital, Belmont, Massachusetts, USA; LPayne{at}mclean.harvard.edu

Introduction Menstrual health is a key patient-reported outcome beyond its importance as a general indicator of health and fertility. However, menstrual function was not measured in the clinical trials of COVID-19 vaccines. The purpose of this review was to synthesise the existing literature on the relationship between COVID-19 vaccination and menstrual health outcomes.

Methods A PubMed search to 31 October 2023 identified a total of 53 publications: 11 prospective cohort studies, 11 retrospective cohort studies or registry-based cohort studies, and 31 cross-sectional or retrospective case–control studies.

Results Identified studies were generally at moderate-to-high risk of bias due to retrospective design, interviewer bias, and failure to include a non-vaccinated control group. Nonetheless, the bulk of the literature demonstrates that COVID-19 vaccine is associated with temporary changes in menstrual characteristics (cycle length and flow) and menstrual pain. Follicular phase (at the time of vaccination) is associated with greater increases in cycle length. Evidence suggests temporary post-vaccine menstrual changes in adolescents, abnormal vaginal bleeding in postmenopausal individuals, and a potential protective effect of using hormonal contraception.

Conclusions In this review we found evidence supporting an association between the COVID-19 vaccine and menstrual health outcomes. Given the importance of menstrual function to overall health, we recommend that all future vaccine trials include menstruation as a study outcome. Future vaccine studies should include rigorous assessment of the menstrual cycle as an outcome variable to limit sources of bias, identify biological mechanisms, and elucidate the impact of stress.

• Reproductive Health

https://doi.org/10.1136/bmjsrh-2024-202274

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Competing interests LAP has served as a consultant for Bayer Healthcare and Mahana Therapeutics. LAW receives in-kind donations from Swiss Precision Diagnostics (home pregnancy tests) and fertility-tracking apps (Kindara) for primary data collection in PRESTO. LAW also receives consulting fees from the Gates Foundation and AbbVie, Inc. SAM has received institutional grants from AbbVie, Inc., National Institutes for Health (NIH), Department of Defense, and the Marriott Family Foundation and received honoraria from the University of British Colombia, WERF, Huilin Shanghai, and University of Kansas Medical Center. SAM has also received travel support from the Society for Reproductive Investigation, ESHRE 2022, FWGBD 2022, University of Michigan, Massachusetts Institute of Technology, ASRM 2022, LIDEA Registry, Taiwan Endometriosis Society, SEUD, and thr Japan Endometriosis Society. SAM has participated on advisory boards for AbbVie, Roche, Frontiers in Reproductive Health, Abbott, Human Reproduction, and LIDEA Registry. ABE received royalties from Up To Date.

Provenance and peer review Not commissioned; externally peer reviewed.

Supplemental material This content has been supplied by the author(s). It has not been vetted by BMJ Publishing Group Limited (BMJ) and may not have been peer-reviewed. Any opinions or recommendations discussed are solely those of the author(s) and are not endorsed by BMJ. BMJ disclaims all liability and responsibility arising from any reliance placed on the content. Where the content includes any translated material, BMJ does not warrant the accuracy and reliability of the translations (including but not limited to local regulations, clinical guidelines, terminology, drug names and drug dosages), and is not responsible for any error and/or omissions arising from translation and adaptation or otherwise.

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