A research gap is a question that existing studies have not yet answered well enough. You find one by reading recent research closely, especially reviews and the limitations and future research sections of strong studies, and noting where evidence is missing, thin or contradictory.
This guide explains the main types of gap, gives a step-by-step method, shows how to check that a gap is real and feasible, and compares weak and strong gap statements.
The Fastest Reliable Way to Find a Gap
Start with recent systematic or scoping reviews in your area, then read the limitations and future research sections of the most relevant studies from the last few years. Map what has been studied by population, setting, method and outcome, and look for empty or conflicting cells.
Then test the gap: search again to confirm it is still open, ask whether it matters, and check that you can study it with the time, access and skills you have.
What Counts as a Research Gap
A gap is not simply something nobody has written about. Many topics are unstudied because they are trivial or impossible to research. A useful gap is a question that matters to a field and that existing evidence leaves unanswered.
Gaps can be large, such as an untested theory, or small and precise, such as a well-studied intervention never evaluated in a particular population. Most master's and many doctoral dissertations address precise gaps well rather than enormous ones poorly.
Types of Research Gap
| Type | What it looks like | Example |
|---|---|---|
| Population gap | Studied in some groups, not others | Burnout studied in frontline nurses, rarely in new nurse managers |
| Contextual gap | Studied in some settings or countries, not others | Remote work research focused on large firms, not small ones |
| Methodological gap | Studied with limited methods | Only cross-sectional surveys, no longitudinal or qualitative work |
| Evidence gap | Findings conflict or are inconclusive | Studies disagree on whether mentoring reduces turnover |
| Theoretical gap | A theory untested or poorly explained in an area | A motivation theory never applied to volunteer retention |
| Practical or knowledge-to-practice gap | Evidence exists but is not used | Guidelines exist but uptake in clinics is low and poorly understood |
| Time gap | Evidence predates a major change | Studies of student engagement before the shift to blended learning |
Many good dissertations combine two types, such as a population gap studied with a method the literature has not yet used. Naming the type helps you write about it precisely and suggests the design you will need. A methodological gap, for instance, points directly to the method you should use.
How to Find a Research Gap, Step by Step
- Narrow your area. Move from a broad field to a topic you can describe in one sentence, such as "retention of newly qualified nurses".
- Read recent reviews. Systematic, scoping and narrative reviews summarize what is known and often state what is missing in their conclusions.
- Read limitations and future research sections. Authors often point directly to the next study needed. Note recurring suggestions across several papers.
- Build a literature map. Use a table with columns for population, setting, design, measures and findings. Gaps appear as empty or conflicting cells.
- Look for contradictions. Where studies disagree, ask what might explain the difference: sample, measure, context or design.
- Talk to people. Supervisors, practitioners and conference audiences know which questions matter and which have already been answered in work not yet published.
- Write a draft gap statement. One or two sentences naming what is known, what is missing and why it matters.
Worked Example: Using a Literature Map
A simple table can show a gap that is hard to see in a pile of papers. The studies below are illustrative.
| Study | Population | Design | Finding |
|---|---|---|---|
| Study A | Frontline nurses | Survey | High burnout linked to workload |
| Study B | Frontline nurses | Longitudinal survey | Burnout predicts intention to leave |
| Study C | Established nurse managers | Interviews | Role conflict drives stress |
| Study D | Mixed nursing staff | Survey | Managers not analyzed separately |
What the map shows. Burnout is well studied in frontline nurses and somewhat in established managers, but no study in this set focuses on nurses in their first months as managers, and the one mixed study does not separate them.
Draft gap statement. "Although burnout among frontline nurses is well documented, little is known about how nurses experience burnout in their first year as managers, a transition linked to new responsibilities and reduced peer support."
How to Check That Your Gap Is Real and Worth Studying
A promising gap still needs testing before you build a dissertation on it. Run it through these questions.
| Test | Question to ask | How to check |
|---|---|---|
| Is it open? | Has someone already answered it? | Search major databases, recent dissertations and preprints with several search terms |
| Does it matter? | Who would benefit from the answer? | Link it to a practical, policy or theoretical problem |
| Is it feasible? | Can you answer it with your time, access and skills? | Check data access, ethics, sample size and timeline |
| Is it yours? | Does it fit your program and supervisor? | Discuss with your supervisor before committing |
| Is it focused? | Could one study answer it? | Write one research question that addresses it |
Searching for recent dissertations is often overlooked. Many unpublished theses address exactly the kind of precise question a new dissertation might choose, and your university library can show you how to search the repositories your field uses.
Be careful with claims such as "no study has ever examined this". They are hard to prove. Safer wording explains how you searched: "a search of the main databases found no study that...".
Weak vs Strong Gap Statements
Weak: "There is little research on remote work, so more research is needed."
Why it is weak: remote work is heavily researched; the statement names no population, no specific missing question and no consequence.
Strong: "Research on remote work has focused mainly on large organizations, and studies of small firms rarely examine how managers maintain team cohesion. Without this evidence, small employers adopting remote work have little guidance on supporting their teams."
The strong version is precise about what is known, what is missing and who is affected. It also leads naturally to a research question and design.
Common Mistakes When Looking for a Gap
- Starting with a method, not a question: "I want to run interviews" is not a gap.
- Relying on old sources: a gap reported years ago may since have been filled.
- Confusing "unstudied" with "important": some questions are open because they do not matter.
- Choosing a gap too big for one study: narrow by population, setting or outcome.
- Ignoring feasibility: a perfect gap is no use if you cannot get access or data.
- Keeping it to yourself: supervisors can save you months by spotting a gap that is already closed.
Gaps at Master's and Doctoral Level
Master's dissertations usually need a clear, evidenced gap that the study can address within a short timeframe. Replicating a study in a new population or setting is often perfectly acceptable at this level.
Doctoral research is expected to make an original contribution to knowledge. Committees look for a gap with wider significance, often linked to theory, and an argument for why filling it changes understanding. Expectations vary by field and country, so discuss what counts as original with your supervisor.
How DissertationHorse Helps You Find a Research Gap
Send your topic, program level, the sources you have read and any supervisor feedback. A writer at Standard, Master or Elite level drafts a custom gap analysis with a literature map, a justified gap statement and possible research questions, for study and reference.
The work is written from scratch and plagiarism-checked. Your identity is never shared with the writer, and free revisions within the scope of your original request are included.
Want Help Identifying and Justifying Your Research Gap?
Send your topic, key sources and any supervisor feedback. You get a custom gap analysis with evidence from the literature, for study and reference.
Order Your Gap AnalysisFree revisions · Full refund if late · Written from scratch for your order
Frequently Asked Questions
A question that existing research has not answered well enough, because evidence is missing, limited or contradictory, and that matters to a field.
Recent systematic and scoping reviews, and the limitations and future research sections of recent studies, are the most efficient starting points.
Search several databases and recent dissertations with varied terms, ask your supervisor and check that recent studies have not already answered it.
Yes, especially at master's level, if you apply it to a new population, setting or time and explain why that matters.
Specific enough for one study to address it, usually defined by population, setting, outcome or method.
It happens. Explain how your study differs, for example in population, method or context, and discuss the new study in your literature review.
Not exactly. The gap is the missing knowledge; the problem statement explains why that gap matters and who it affects.
There is no fixed number. You need enough recent, relevant evidence to show convincingly what is known and what is not.