How to write a literature review: a step-by-step guide with structure and examples

A literature review is one of the most common, and most misunderstood, academic assignments. It appears as a standalone paper, as a chapter in a thesis or dissertation, and as a section in research papers and proposals.

The biggest mistake students make is writing a list of summaries: "Smith (2019) found... Jones (2020) found... Lee (2021) found...". A strong literature review does something different. It synthesizes research to show what is known, how studies relate to one another, where they disagree, and what remains unanswered.

What a literature review does

A good literature review:

• Maps the field: the main theories, debates and findings on your topic.
• Evaluates the quality and relevance of existing research.
• Synthesizes: connects studies by theme, method or finding.
• Identifies gaps: what hasn't been studied, or where evidence conflicts.
• Justifies your own research question (in a thesis or proposal).

Step 1: Define your scope

Before you search, decide:

• Your research question or topic focus. "Social media and mental health" is too broad. "Social media use and anxiety in university students" is workable.
• Time frame. For example, research published in the last 10 years, unless older foundational studies are essential.
• Types of sources. Usually peer-reviewed journal articles, plus key books and reports.
• Inclusion and exclusion criteria. Populations, settings, methods or languages you'll include.

Write these down. They'll keep your search focused and help you explain your method.

Step 2: Search systematically

Use academic databases appropriate to your field:

• General: Google Scholar, your library's discovery search, JSTOR.
• Health and nursing: PubMed, CINAHL.
• Psychology: PsycINFO.
• Education: ERIC.
• Business: Business Source Complete, ABI/INFORM.

Search techniques

• Keywords and synonyms: list alternatives (for example "anxiety", "anxious", "generalized anxiety").
• Boolean operators: AND narrows, OR broadens, NOT excludes. Example: ("social media" OR "social networking") AND anxiety AND ("university students" OR "college students").
• Filters: date range, peer-reviewed, language.
• Citation chasing: check the reference lists of key articles (backward) and see who has cited them since (forward).

Keep a record of the databases and search terms you used. Some assignments require you to report it.

Step 3: Screen and read efficiently

You don't need to read every article in full at first.

1. Read titles and abstracts to decide relevance.
2. Skim the introduction, methods and conclusion of relevant articles.
3. Read closely only the studies central to your question.

Step 4: Organize with a synthesis matrix

A synthesis matrix is a table that makes synthesis much easier. Each row is a source; each column is a theme or feature.

Reading across rows tells you about each study. Reading down columns shows you how studies agree or disagree on each theme. That's synthesis.

Step 5: Choose a structure

Thematic (most common)

Organize by themes or sub-topics. For example: frequency of use; active vs passive use; individual differences; methodological issues. This structure naturally encourages synthesis.

Chronological

Organize by how research developed over time. Useful when the history of the debate matters, but it can slide into listing summaries.

Methodological

Organize by research approach: for example, survey studies, then experimental studies, then qualitative studies. Useful when methods explain differences in findings.

Many reviews combine approaches, for example thematic sections with a methodological comparison within each.

Step 6: Write it

Introduction

• Introduce the topic and why it matters.
• State the scope and focus of the review.
• Briefly explain how you found and selected sources (if required).
• Outline the structure.

Body

For each theme:

1. Open with a synthesis statement, a topic sentence that makes a claim about the literature. For example: "Studies consistently link frequent social media use with higher anxiety, but the strength of the association varies considerably."
2. Support it with evidence from multiple sources, grouped together.
3. Compare and contrast: where do studies agree, and why might they differ (sample, method, measures)?
4. Evaluate: note strengths and limitations that affect how much weight to give the findings.
5. Link to the next theme.

Conclusion

• Summarize the main findings across themes.
• Identify the key gaps and limitations in the literature.
• Explain implications for practice or future research, or how the gaps lead to your own research question.

Summary vs synthesis: an example

Summary (weak):

Smith (2019) found that students who used social media more had higher anxiety. Jones (2020) found that only passive use was linked to anxiety. Lee (2021) found a weak association.

Synthesis (strong):

Although several studies report a positive association between social media use and anxiety (Lee, 2021; Smith, 2019), longitudinal evidence suggests the type of use may matter more than the amount: Jones (2020) found that passive scrolling, but not active posting, predicted later anxiety. The cross-sectional design of most studies also makes it difficult to determine the direction of the relationship.

The synthesis groups sources, compares them, explains a difference and evaluates the evidence.

Phrases that help you synthesize

• "Several studies suggest... (A; B; C)."
• "In contrast, ... found..."
• "These findings are consistent with..."
• "One explanation for these differences is..."
• "However, most of this research relies on..."
• "Little research has examined..."

Common mistakes

• Listing summaries one source at a time.
• Including sources that aren't relevant to your question.
• Relying too heavily on one or two sources.
• Not evaluating study quality.
• Forgetting to identify gaps.
• Inconsistent citation style. See our APA 7 formatting guide.

Frequently asked questions

How many sources should a literature review have?

It depends on level and length. A short undergraduate review may use 10 to 20 sources; a dissertation chapter may use far more. Follow your assignment guidance.

Can I use "I" in a literature review?

It depends on your discipline and instructor. APA Style permits first person where appropriate, but many instructors prefer a more impersonal tone.

What's the difference between a literature review and an annotated bibliography?

An annotated bibliography summarizes and evaluates sources one by one. A literature review synthesizes them into an argument organized by theme.

What is a systematic review?

A systematic review follows a formal, pre-defined, reproducible search and selection method, often with a protocol. Most student literature reviews are narrative reviews, which are less formal.

Get support with your literature review

We offer research support (help with search strategy, database selection and organizing sources), feedback on structure and synthesis, and editing for clarity and APA formatting.

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