How to Write a Literature Review: Steps, Structure and Examples

Most students write a literature review as a list of summaries. Markers read it as proof that you understand your field. Here is how to bridge that gap. A literature review is one of the most important and most misunderstood sections of any academic essay or dissertation. Many students think a literature review is simply a summary of sources — it is not. It is a critical synthesis of existing research that demonstrates your understanding of the field, identifies gaps in knowledge and justifies your own research approach. This guide explains exactly how to write a literature review that impresses your markers.

What Is a Literature Review?

A literature review surveys, evaluates and synthesises existing academic research on a topic. Its purpose is to show what is already known, identify debates and contradictions in the field, highlight gaps your research will address, and position your work within the broader academic conversation. A good literature review does not just describe what each source says — it shows how sources relate to each other, where they agree and disagree, and what questions remain unanswered.

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Step 1 — Search for Sources

Use academic databases to find peer-reviewed sources. The most useful include Google Scholar, JSTOR, PubMed (health and medicine), PsycINFO (psychology), Scopus and your university library database. Search using keywords related to your topic, and use Boolean operators to refine your results: AND (narrows results), OR (broadens results), NOT (excludes terms). Aim for sources published within the last 10 years unless you are reviewing foundational or historical literature. As a rough guide, many students use around 15 to 20 sources for a 3,000-word dissertation literature review, but check your brief. Our guide on how to find credible academic sources covers this in detail.

For a step-by-step method, including how to build search terms and keep a search log, see our guide to finding and screening sources for a research paper.

Step 2 — Evaluate and Select Sources

Not all sources are equal. Evaluate each source using the CRAAP test: Currency (is it recent?), Relevance (does it relate to your topic?), Authority (is the author credible?), Accuracy (is the information supported by evidence?), Purpose (why was it written?). Prioritise peer-reviewed journal articles and academic books. Avoid websites, blogs and Wikipedia as primary sources.

Step 3 — Identify Themes and Gaps

Before writing, organise your sources by theme rather than by author. Look for patterns: Where do sources agree? Where do they contradict each other? What questions have not been answered? What methodologies have been used? Create a thematic map or table to organise your sources before you begin writing.

A synthesis matrix makes themes and gaps visible before you write. Rows are sources and columns are themes, as in this fictional example:

Reading down a column shows where sources agree, disagree or say nothing. Empty cells often point to the gap your own research can address.

Step 4 — Choose a Structure

There are three main ways to structure a literature review: Thematic (organised by theme or concept — most common and recommended), Chronological (organised by publication date — useful for showing how thinking has evolved), or Methodological (organised by research method — useful for methodology-focused dissertations). Thematic structure is the most common choice for undergraduate and postgraduate work, though your brief or supervisor may prefer another.

Step 5 — Write and Synthesise

The key skill in a literature review is synthesis — combining ideas from multiple sources rather than describing them one by one. Instead of: "Smith (2020) found X. Jones (2021) found Y. Brown (2022) found Z." Write: "Research consistently shows X (Smith, 2020; Jones, 2021), although Brown (2022) challenges this finding by arguing Y." Use linking phrases to show relationships between sources: "Similarly...", "In contrast...", "Building on this work...", "This finding is supported by...", "However, critics argue..."

A Paragraph Template

A synthesised paragraph usually follows four moves:

1. Make your point. Open with a claim about the theme, in your own words.
2. Bring in evidence. Cite two or three sources that support the claim.
3. Compare or challenge. Show where sources disagree, or where a method or sample limits the evidence.
4. Link back. Say what this means for your research question or the gap you are addressing.

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Sample Outline for a 3,000-Word Literature Review

The split below is a guide, not a rule. Adjust it to your brief and the number of themes you have.

Common Mistakes to Avoid

• Summarising instead of synthesising — the most common error
• Including too many direct quotes — paraphrase and cite instead
• Ignoring contradictory evidence — acknowledge debates honestly
• Using non-academic sources — stick to peer-reviewed literature
• No clear structure — use themes, not a source-by-source approach
• Failing to link to your own research — always show how the literature relates to your study
• Never stating the gap — say clearly what is missing from the evidence

Final Checklist

• ✅ Sources are mainly peer-reviewed, relevant and recent enough for your topic
• ✅ Paragraphs are organised by theme, not by author
• ✅ Each paragraph makes a point and compares several sources
• ✅ Disagreements and limitations are acknowledged
• ✅ The gap is stated and linked to your research question
• ✅ Quotes are kept to a minimum and everything is cited consistently
• ✅ You have proofread for clarity, tense and referencing style

FAQs

How long should a literature review be?

For a dissertation, the literature review is often around 15 to 25% of the total word count, though this varies by subject and institution. For a 10,000-word dissertation, that is roughly 1,500 to 2,500 words. For a standalone literature review assignment, follow your brief.

How do I start a literature review?

Start with a clear research question, then search academic databases using keywords and Boolean operators, and keep a search log. Read each source with notes on its method, findings and limitations, then group your sources into themes before you write.

How do I organise a literature review by theme?

List the main findings or arguments across your sources, then group sources that address the same question into three to five themes and give each theme a section. A table with sources in rows and themes in columns helps you see where sources agree, disagree and leave gaps.

How do I avoid just summarising sources?

Open each paragraph with your own point about the theme, not with an author's name. Then bring in several sources to support or challenge that point, compare them, and finish by explaining what this means for your research question.

Should I include my own opinion in a literature review?

Yes, but carefully. You should evaluate and critique the sources rather than simply accepting them. However, avoid first-person statements unless your institution permits them. Use phrases like "this argument is limited by..." or "this evidence suggests..."

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

An annotated bibliography lists sources individually with a short summary and evaluation of each one. A literature review synthesises sources together into a connected, thematic discussion that shows how they relate to each other and to your own research. It is a more integrated and analytical piece of writing.

How many sources should I include in a literature review?

This depends on the length and level of your work, so check your brief. As a rough guide, many students use around 15 to 20 sources for a 3,000-word dissertation literature review. Always prioritise the quality and relevance of sources over hitting a specific number.

Can I include non-academic sources in a literature review?

Generally no. A literature review should be built primarily on peer-reviewed journal articles, academic books and credible reports. Non-academic sources such as news articles, blogs or Wikipedia are rarely acceptable and should only be used sparingly for context, never as the core evidence base.