How to Write a Literature Review (Step by Step)

A literature review isn't a list of summaries. It's an argument about the state of knowledge on your topic — what's known, what's contested, and where the gaps are. Done well, it sets up your own research as the obvious next step. Here's how to build one.

Step 1: Define a focused question

Before you read anything, narrow your scope. "Social media and mental health" is a book; "the link between Instagram use and body image in teenage girls" is a literature review. A tight question keeps your search manageable and your review coherent.

Step 2: Search the literature systematically

Use your library databases, Google Scholar and subject-specific indexes. Keep a record of your search terms and which databases you used — you may need to describe your method. For each promising source, save the citation immediately so you don't lose it later.

• Start with recent review articles — they map the field fast.
• Follow citation trails backwards (what a paper cites) and forwards (who cites it).
• Prioritise peer-reviewed work and seminal older studies everyone references.

Step 3: Organise by theme, not by author

This is the step that separates a strong review from a weak one. Do not write "Smith (2019) found… Then Jones (2020) found…" paragraph after paragraph. Instead, group sources by the themes, debates or methods they share, and write a section on each theme that brings multiple sources into conversation.

The unit of a literature review is the idea, not the paper.

Step 4: Synthesise, don't summarise

Within each theme, show how studies agree, disagree, build on or contradict each other. Phrases like "Consistent with X, several studies report…" or "In contrast, Y argues…" signal synthesis. Point out patterns, methodological differences and unresolved tensions.

Step 5: Identify the gap

End by naming what the literature hasn't yet answered — the gap your own work will address. This is the bridge from your review to your research question, and examiners look for it directly.

Structure at a glance

1. Introduction — your topic, scope and how the review is organised.
2. Thematic sections — one per theme, synthesising sources.
3. Conclusion — the overall state of knowledge and the gap you'll fill.