“Find a gap in the literature” is the least useful instruction in undergraduate supervision. It implies that gaps are objects lying about waiting to be picked up, and that you will recognise one when you see it. Neither is true. A research gap is something you construct by reading carefully and then argue for in two or three sentences — and there are only about six shapes it can take.
This guide names the six, gives you a procedure for finding one in your own reading, and shows you worked gap statements and rationale paragraphs across several subjects. It is written for UK undergraduate dissertations, where the gap has to be real enough to justify the project and modest enough to be defensible.
The six kinds of gap
Almost every defensible undergraduate gap is one of these. Knowing the list turns “read until inspiration strikes” into a search with categories.
| Type | What is missing | How it sounds |
|---|---|---|
| Population gap | The relationship has been studied, but not in this group | “…has been examined among graduate employees, but not among apprentices.” |
| Context gap | Studied elsewhere, not here — country, sector, setting | “…established in large organisations, where policy is formal.” |
| Method gap | Studied only one way, and the design limits what can be concluded | “…rests entirely on cross-sectional self-report.” |
| Conflict gap | Studies disagree and nobody has explained why | “…findings diverge, and the source of the divergence has not been examined.” |
| Theory-application gap | A theory exists but has not been tested in this domain | “…job embeddedness has not been applied to firms without HR functions.” |
| Recency gap | The evidence predates a change that plausibly invalidates it | “…the evidence base predates the policy change of 2024.” |
Two warnings about this table. First, the population and context gaps are the easiest to claim and the weakest on their own — “nobody has studied this in Leeds” is not a reason to study it in Leeds. They become strong when you can say why the existing finding might not transfer. Second, the recency gap is the one most often asserted without evidence; if you claim the world changed, name the change.
A procedure for finding one
Do this with ten to fifteen sources, not with everything you will eventually cite.
- Build a table with one row per study and columns for population, setting, method, finding and stated limitation.
- Read the limitations column first. Authors tell you their own gaps, and undergraduates almost never look. A limitation repeated across three papers is a gap with free evidence attached.
- Read the “future research” sentences. Most empirical papers end with one or two. They are the single richest source of defensible undergraduate projects.
- Look down the population and setting columns for empty regions. Where they are empty, ask the transfer question: is there a reason the finding would differ here? If you cannot answer that, it is a hole, not a gap.
- Look for disagreement. Two rows with opposite findings and different methods is a conflict gap and usually the most interesting option available to you.
- Check feasibility before you commit. A genuine gap you cannot address in twelve weeks with no budget is not your gap this year.
Step 6 is the one that separates a workable dissertation from an ambitious one. Our guide to a twelve-week dissertation timeline is a realistic test of whether the project fits the time you actually have.
Writing the gap statement
A gap statement is three sentences. What is established; what is missing; why that absence matters. It appears in compressed form in your introduction and in evidenced form at the end of your literature review.
Established: Studies of flexible working and retention converge on an association between reduced co-presence and weaker informal learning among junior staff.
Missing: That evidence comes almost entirely from large organisations, in which hybrid working is a written policy applied consistently.
Why it matters: In firms without formal HR functions, arrangements are negotiated individually and vary between employees, so the independent variable itself is different in kind — and whether the association holds there has not, to this author’s knowledge, been examined.
The hedge in that final sentence is doing real work. “To this author’s knowledge” and “appears not to have been” are honest and defensible. “No research has ever examined” is almost always false and invites a marker to disprove it in one search.
Worked gap statements across subjects
| Subject | Gap statement | Type |
|---|---|---|
| Psychology | “Stereotype threat effects on numerical performance are well established in laboratory settings, but the field evidence in genuinely high-stakes assessment is sparse, and the two settings differ in exactly the way the mechanism predicts should matter.” | Context / method |
| Nursing | “Reviews of hand-hygiene interventions report consistent short-term compliance gains, but very few studies follow up beyond three months, so whether the improvement persists is unresolved.” | Method |
| Education | “Research on retrieval practice is concentrated in secondary science; its effectiveness in primary humanities, where the material is less factually discrete, has received little attention.” | Population / context |
| Business | “Studies of employer branding sample large graduate recruiters almost exclusively, leaving unexamined the SMEs that compete for the same candidates without a recruitment budget.” | Population |
| Criminology | “Accounts of media framing of knife crime draw predominantly on national newspapers; regional coverage, which is closer to the communities affected, has been analysed far less often.” | Context |
The rationale is not the gap
Students routinely treat these as the same paragraph. They are not. The gap says what is missing from the literature. The rationale says why filling it is worth someone’s time, and a strong undergraduate rationale usually has two halves:
- The academic half. What the study adds to understanding — testing a theory somewhere new, reconciling a disagreement, or supplying evidence where only assumption exists.
- The practical half. Who could act differently if they knew the answer. Name them: a profession, a type of organisation, a policy, a group of practitioners.
A worked rationale, following the gap statement above:
Establishing whether the association holds in smaller firms matters for two reasons. Theoretically, it tests whether job embeddedness operates through formal policy or through the social ties policy happens to produce — a distinction the large-firm literature cannot separate, because in those settings the two always co-occur. Practically, SME owner-managers are currently setting hybrid arrangements by instinct, with no evidence specific to organisations of their size, and the cost of losing a trained employee falls proportionately harder on them than on a large employer.
Notice that the practical half names a decision someone is actually making. “This research will be useful for managers” is not a rationale; “owner-managers are choosing between these arrangements now, without evidence” is.
Five things markers flag
- A gap that appears from nowhere. If the preceding pages did not build towards it, it reads as bolted on. The gap should feel inevitable by the time you state it.
- Overclaiming. “No study has ever” is disprovable and reads as unread. Hedge honestly.
- A gap of convenience. Choosing a population because it is easy to recruit, then reverse-engineering a justification. Markers recognise the shape.
- No transfer argument. Asserting that a finding may not hold in a new context without saying why it might not.
- Rationale collapsed into significance-speak. “This is an important area” is filler. Name who would act differently.
Where the gap lives in the dissertation
In three places, at different lengths. Two or three sentences in the introduction, as move four of the standard introduction structure — our guide to the dissertation introduction chapter shows where it sits. A fully evidenced version at the end of the literature review, where each clause is supported by the studies you have just reviewed; our annotated literature review example shows the sentence patterns that build to it. And once more, briefly, in the discussion, where you say what the study actually contributed to it.
If you are still choosing a topic rather than refining one, start from our dissertation topic ideas by subject, and remember that the subject topic banks — for economics and law, among others — already pair each topic with a research question, which shortens the distance to a gap considerably.
If the reading is done and the gap paragraph will not come out, that is usually a structuring problem rather than a thinking one. Tesify drafts the gap and rationale from the sources you have added, so you are editing an argument rather than staring at a blank paragraph. Everything stays 100% written by you, and it is free to start.
Frequently asked questions
What is a research gap in a dissertation?
A specific, defensible claim that something is not yet known, established or resolved in the existing research — usually a missing population, context, method, explanation, application or time period — together with a reason the absence matters.
Does an undergraduate dissertation need an original research gap?
It needs a defensible one, not an original contribution to knowledge in the doctoral sense. Applying an established question to a context that has not been examined is entirely acceptable at undergraduate level.
How do I know a gap is real and not just something I have not found?
Search deliberately for the thing you think is missing, in more than one database, before you claim it is absent. Then hedge the claim. A gap you searched for and did not find is defensible; one you simply did not encounter is not.
Where should the gap statement go?
Compressed in the introduction, evidenced at the end of the literature review, and revisited briefly in the discussion.
How long should the rationale be?
A paragraph, typically 150–250 words, with an academic half and a practical half. Longer usually means it has turned into a literature review.
Can my gap be that nobody has studied my town or my university?
Only if you can say why the finding might differ there. A place name alone is a hole; a reason the mechanism might operate differently is a gap.
What if I find my gap has already been filled halfway through?
Say so and reframe rather than hiding it. A study that replicates or extends recent work, and explains that this is what it is doing, is entirely respectable. Concealing a paper a marker can find is not.
Is the gap the same as the research problem?
No. The problem is the real-world situation that makes the topic matter; the gap is what the research literature has not yet settled about it. Strong introductions contain both.