Markers see the same handful of problems again and again in literature reviews, and most of them are invisible to the person who wrote the chapter. The writing feels fine. The reading was thorough. The mark still comes back lower than expected.
These are the literature review mistakes that cost the most marks, in roughly the order they cost them.
Summarising instead of synthesising
This is the big one, and it accounts for more lost marks than everything else combined.
A summarising review moves through sources one at a time. Smith found this. Jones found that. Patel found something else. Each paragraph is accurate, each source is correctly cited, and the chapter as a whole argues nothing.
A synthesising review moves through ideas, and pulls sources in as evidence. The difference shows up in the first three words of your paragraphs. If they are usually a surname, you are summarising.
The fix is not to write better sentences. It is to rebuild the section around questions the field disagrees about, then place each source inside the argument where it belongs. Our guide on how to structure a literature review works through this in detail.
Describing studies without evaluating them
Reporting what a study found is a first-year skill. Your marker is looking for judgement.
Was the sample large enough to support the claim? Was it drawn from a population that resembles yours? Did the measure actually capture the construct, or a proxy for it? Has anyone failed to replicate it?
You do not need to attack every source. You do need to show that you can tell a strong study from a weak one, and say why. A review in which every cited work is treated as equally authoritative reads as uncritical, whatever else it does well.
No gap, or a gap nobody would care about
The review exists to justify your study. If a reader finishes it without understanding why your research was worth doing, the chapter has failed at its main job.
Two versions of this go wrong. The first is having no gap at all, where the review simply stops. The second is subtler: a gap that is real but trivial. “No one has studied this in Leeds specifically” is technically true and rarely interesting. Ask whether the answer would change anything. If it would not, the gap needs reframing.
A gap worth naming usually comes from a tension in the literature rather than an absence in it — two credible bodies of work that disagree, or a finding that has never been tested outside the conditions that produced it.
Relying on textbooks and secondary sources
Citing a textbook’s account of a study rather than the study itself is one of the fastest ways to signal that you have not done the reading.
Textbooks are useful for orientation. They are not evidence. The same applies to citing a review article for a finding rather than the original paper, and to quoting an author quoting someone else. Track down the source and cite it directly. If you genuinely cannot access it, say so with the appropriate secondary citation format rather than hiding it.
Sources that are too old, or too uniformly new
Most fields expect the bulk of your citations to be recent, commonly within the last five to ten years, with older work included where it is foundational.
The mistake runs in both directions. A review built mainly on work from twenty years ago suggests you searched once and stopped. A review containing nothing older than 2020 suggests you have no idea where the ideas came from, and it usually means you have missed the paper that started the debate you are describing.
Citing sources you have not read
It shows more clearly than students expect.
A source you have read gets discussed, qualified or compared. A source added to raise the citation count appears once, in a bracket, alongside four others, and never returns. When a third of your bibliography behaves that way, the pattern is obvious from the page.
Thirty sources you can talk about beats eighty you cannot. This is one of the few places in academic writing where less genuinely scores higher.
Letting the review drift from your research question
Reading is interesting, and it is easy to follow a thread that fascinates you but has nothing to do with your study.
Every section of your review should be defensible in one sentence beginning “This is here because”. If you cannot finish that sentence for a section, it is background reading rather than review material, and it belongs in your notes rather than your chapter.
Ignoring evidence that contradicts you
Leaving out the studies that undermine your position is the most damaging mistake on this list, because a marker who knows the field will spot the omission immediately, and it changes how they read everything else you have written.
Engaging with contrary evidence is not a weakness in your argument. It is the argument. Name the strongest opposing work, represent it fairly, and then explain why your position still holds — different context, different population, a methodological limitation you can point to. That is what critical writing looks like.
Inconsistent referencing
It is not the intellectual heart of the chapter, but it is the easiest mark to lose and the easiest to protect.
Mixed styles, missing page numbers on direct quotations, entries in the reference list that never appear in the text, and citations in the text that never appear in the list — all of them are checked, and all of them are avoidable in an afternoon. If you are unsure which system your department wants, our guide comparing Harvard and APA referencing sets out the differences.
Writing it first and never coming back
The literature review is usually drafted early and then left alone while the rest of the dissertation is written.
By the time you have collected your data, your understanding of the field has moved. Findings you thought were peripheral turn out to matter. The gap you named at the start may need sharpening to match what you actually did. Reread the chapter after your analysis is finished, and expect to revise it. Reviews that are never revisited tend to sit slightly out of step with the study they are supposed to justify.
Getting the length wrong
Both directions are penalised, and both are usually symptoms of the problems above rather than problems in themselves. Reviews run long because they summarise, and short because they describe without evaluating.
If you are unsure what you should be aiming for, we set out the expected word counts by degree level in our guide on how long a literature review should be, and there is a worked example showing the same material written badly and then rewritten properly.
If your draft has come back marked up
A supervisor’s comments on a literature review are usually structural even when they sound like they are about writing. “This is descriptive” means rebuild the sections. “Where is your voice?” means you have not evaluated anything.
Our dissertation writing help includes reworking chapters that have come back for revision, and our proofreading and editing service covers the referencing and consistency pass before submission.