How to Write a Literature Review UK Dissertation: Step-by-Step Guide 2026

What Is a Literature Review?

A literature review is a critical synthesis of existing research, theory, and evidence on a specific topic. It is not an annotated bibliography or a simple summary of sources read in sequence. A strong literature review demonstrates that you understand the intellectual landscape of your field, can identify patterns and debates within the existing research, and can position your own research in relation to what has come before.

Why the Literature Review Is Critical to Your Dissertation

The literature review serves multiple essential functions: it demonstrates your depth of reading and engagement with your field; it establishes the theoretical framework for your study; it justifies why your research is needed by identifying gaps, contradictions, or limitations in existing work; and it provides the conceptual lens through which you will interpret your findings.

Step 1: Systematic Literature Search

Begin with a structured search across multiple academic databases: Google Scholar, JSTOR, PubMed (health sciences), EBSCO, PsycINFO (psychology), and your university library catalogue. Use Boolean operators (AND, OR, NOT) to refine your search. Track your search terms and results in a spreadsheet. Set clear inclusion and exclusion criteria for which sources to include.

Step 2: Critically Evaluate Your Sources

Apply the CRAAP test to each source: Currency (how recent?), Relevance (directly relevant to your research question?), Authority (peer-reviewed journal, credible author, reputable publisher?), Accuracy (evidence-based, cited sources, methodology explained?), and Purpose (objective scholarly work, not promotional material).

Step 3: Identify Themes, Patterns and Gaps

Group your sources thematically rather than chronologically or author-by-author. Ask: What are the major theoretical perspectives on this topic? Where do researchers agree? Where is there disagreement or ongoing debate? What aspects of the topic remain understudied or contested?

Step 4: Structure Your Literature Review

A well-structured literature review typically follows this pattern: Introduction (scope, search strategy, organisation of the review), Thematic sections (one per major theme with synthesis across sources), Critical evaluation within each section, and Conclusion (summary of what the literature shows, identification of gaps, statement of how your research addresses them).

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Frequently Asked Questions

How long should a literature review be? Typically 15-20% of your total dissertation word count. For a 10,000-word dissertation, aim for 1,500-2,000 words.

How many sources should I include? Most UK undergraduate dissertations require 20-40 sources; postgraduate dissertations typically require 40-80+ sources.