How to Write a Literature Review

The literature review is the part of your paper or dissertation that most students get wrong. They read ten articles, summarise each one in a paragraph, and call it done. A real literature review does the opposite: it synthesises — finding connections, contradictions, and gaps across sources rather than describing them individually.

What a Literature Review Is For

A literature review serves three functions:

1. Demonstrate knowledge — show your reader (and marker) that you understand the existing research in your field
2. Contextualise your research — show where your paper fits within the broader conversation
3. Justify your research — identify the gap, question, or problem that your research addresses

Summary vs. Synthesis

This is the most important distinction to understand. Summary describes what individual sources say. Synthesis connects them — showing relationships, agreements, contradictions, and patterns across multiple sources.

How to Structure a Literature Review

There are three common approaches:

Thematic structure (most common)

Group sources by theme or concept rather than by author or chronology. Each section explores a different aspect of the literature relevant to your research question. This is the most analytical structure and usually produces the strongest literature review.

Chronological structure

Trace the development of ideas over time. Useful when the history of a debate is itself the point — when showing how thinking has evolved is central to your argument.

Methodological structure

Organise by research method (qualitative vs. quantitative studies, experimental vs. observational research). Useful in methodology-focused reviews and systematic reviews.

The Literature Review Process

• Search systematically — use academic databases (Google Scholar, JSTOR, Scopus), and keep records of your search terms so you can reproduce and report your method
• Screen for relevance — read abstracts first; only retrieve full texts for sources that directly address your question
• Take thematic notes — as you read, note what theme each source relates to, not just what it says. Use a spreadsheet or reference manager (Zotero, Mendeley)
• Identify patterns — where do sources agree? Where do they contradict? What questions remain unanswered?
• Draft by theme — write each thematic section by bringing together multiple sources, comparing and contrasting their positions

How to Be Critical Without Being Harsh

Critical analysis doesn't mean dismissing studies. It means evaluating them fairly: acknowledging what they contribute while noting their limitations.

Useful evaluative phrases:

• "While this study provides useful data, its small sample size (n=24) limits generalisability."
• "This framework is widely cited, though later empirical work has challenged its applicability in non-Western contexts (Li, 2022)."
• "Despite its theoretical appeal, this model lacks empirical validation in clinical settings."

Finding and Stating the Gap

Your literature review should build toward a clear statement of the gap or research need your paper addresses. This is often one of the most important sentences in your entire dissertation or paper.

Common gap statements:

• Missing population — "Existing studies focus predominantly on Western contexts; little research addresses [your population]."
• Methodological gap — "Previous studies rely largely on self-report measures; no study has used [your method]."
• Contradictory findings — "Studies disagree on whether X causes Y; no study has investigated the moderating role of Z."
• Outdated research — "The most recent study dates from 2015; subsequent changes in [context] have not been investigated."