How to Write a First-Class Literature Review for Your Dissertation

A first-class dissertation literature review does more than summarise what has been published. It synthesises sources into an argument, critically evaluates the quality of the evidence, identifies a specific gap that your research will address, and ends with a conceptual framework that leads directly into your methodology. A 2:1 review usually shows good reading and organisation; a first shows judgement.

If you need the fundamentals first, start with our general guide on how to write a literature review. This article focuses on the dissertation level and on what moves a review from a 2:1 to a first.

What separates a first-class literature review from a 2:1

UK marking criteria vary between universities, but the descriptors for 70% and above consistently mention originality, critical insight and sophisticated synthesis. In practice, that looks like this:

For more on how classifications are awarded, see our guide to the UK university grading system.

Synthesis, not summary

Synthesis means combining sources to make a point that none of them makes alone. Instead of "Author A found X. Author B found Y.", you write about the pattern: where studies agree, where they conflict, and why.

Here is a sample paragraph showing the difference, using hypothetical studies on hybrid working.

Summary (2:2 to 2:1 level): "Jones (2021) surveyed 400 office workers and found that hybrid working increased job satisfaction. Lee (2022) interviewed 25 managers and found hybrid working made team communication harder. Ahmed (2023) found productivity stayed the same."

Synthesis (first-class level): "Evidence on hybrid working divides along methodological lines. Large employee surveys report higher job satisfaction (Jones, 2021), whereas qualitative studies with managers highlight weakened team communication (Lee, 2022), suggesting that benefits and costs are experienced by different groups within the same organisation. Ahmed's (2023) finding of unchanged productivity may reconcile these views, but its reliance on self-reported output limits the strength of that conclusion. What remains unexamined is how line managers in small firms, who lack formal hybrid policies, balance these competing pressures, which is the focus of this study."

The second paragraph groups sources, explains disagreement through method, evaluates evidence quality and ends by pointing to the gap. That is the pattern to repeat throughout your review.

Critical evaluation: questions to ask of every source

• Method: is the design appropriate for the question? Would a different method have produced different results?
• Sample: how large, how representative, and from which country or sector?
• Context and date: do findings from 2010 still apply after major changes in technology, policy or society?
• Theory: what assumptions does the author bring?
• Consistency: does this study agree with others? If not, why might that be?
• Relevance: how directly does it inform your research question?

You don't need to criticise every paper in detail. Focus your evaluation on the studies your argument depends on most.

Your search strategy

A dissertation literature review needs a transparent, repeatable search strategy, and many supervisors expect a short paragraph or appendix describing it.

1. Choose databases for your discipline: for example Scopus and Web of Science (multidisciplinary), PubMed and CINAHL (health), PsycINFO (psychology), Business Source Complete (business), ERIC (education), plus Google Scholar for cross-checking.
2. Build keyword groups: list synonyms for each concept in your question, such as "hybrid work", "remote work", "telework".
3. Combine with Boolean operators: use OR within a concept group and AND between groups, and NOT sparingly. For example: ("hybrid work" OR "remote work" OR telework) AND (manager OR supervisor) AND ("small business" OR SME).
4. Use truncation and phrases: quotation marks search for exact phrases, and an asterisk finds word endings (manag* finds manager, managers and management). Syntax varies slightly by database.
5. Set inclusion and exclusion criteria: such as publication date range, language, peer-reviewed only, population and setting. Justify each one.
6. Screen and record: screen by title, then abstract, then full text, recording numbers at each stage. In a systematic review this is often shown in a PRISMA flow diagram.
7. Snowball: check the reference lists of key papers and use "cited by" links to find newer work.

Systematic vs narrative review

Most taught dissertations use a narrative (traditional) literature review, sometimes with a systematic search strategy. A systematic review is a research method in its own right: it follows a pre-specified protocol, exhaustive searching, formal quality appraisal and often meta-analysis. Some programmes, particularly in health, allow a systematic or "systematic-style" review as the entire dissertation.

Check which your programme expects before you start searching.

A synthesis matrix example

A synthesis matrix is a table with sources as rows and themes as columns. It makes patterns, agreements and gaps visible before you write.

Reading down each theme column shows you the argument; reading across the "Not examined" cells shows you the gap. (These are hypothetical studies for illustration.)

Organising dozens of sources into an argument is where many students get stuck. AssignmentHelpKit's research support offers guidance on search strategies, synthesis and structure.

How to structure a literature review

1. Thematic: sections built around key themes or debates. This is the most common and usually the strongest for a dissertation because it supports synthesis.
2. Chronological: traces how thinking developed over time. Useful when the history of a debate matters, but risks becoming descriptive, so organise it around turning points rather than dates.
3. Methodological: groups studies by research approach (for example quantitative surveys vs qualitative case studies). Useful when methods explain why findings differ, and good for justifying your own methodology.

Many first-class reviews combine these, for example a thematic structure with a methodological discussion inside each theme. Whatever you choose, open with a short introduction to scope and structure, and close with a summary that states the gap and presents your conceptual framework.

The gap and the conceptual framework

The gap should be specific: a population, context, method or variable that has not been studied, or conflicting findings that need resolving. Then show how key concepts from the literature fit together in a conceptual framework, a diagram or short description of the variables or ideas you will investigate and how you expect them to relate. This bridge between the literature and your research questions is one of the clearest signals of first-class work.

Word allocation by dissertation length

The literature review is usually around 20 to 30% of a dissertation. Use your handbook first, but these are sensible starting points:

Check your drafts with the word counter so one theme doesn't swallow the others.

Getting support with your dissertation

If you want feedback on your search strategy, a model literature review to learn from, or proofreading and feedback before submission, AssignmentHelpKit's dissertation support team can help. Share your brief on WhatsApp for a free quote and expert guidance.

Frequently asked questions

How long should a dissertation literature review be?

Typically 20 to 30% of the total word count, so around 2,500 to 3,000 words in a 10,000-word dissertation. Some disciplines and Master's programmes expect more. Always follow your handbook and your supervisor's guidance.

How many sources should a dissertation literature review have?

There is no fixed number, but undergraduate dissertations commonly draw on roughly 30 to 60 sources and Master's dissertations on more. Quality and relevance matter more than quantity: a first-class review critically evaluates the key studies rather than listing as many as possible.

What is the difference between a systematic and a narrative review?

A narrative review builds an argument from purposefully selected literature and is the norm for a dissertation chapter. A systematic review follows a strict protocol to find, appraise and synthesise all relevant evidence on a focused question, and can be a dissertation in its own right.

How do I show critical evaluation in a literature review?

Comment on methods, samples, context and consistency, and explain how these factors account for differences between studies. Use evaluative language such as "this conclusion is limited by" or "stronger evidence comes from", and make sure each paragraph ends with your own judgement.