How to Do a Literature Review and Find a Research Gap
When you start a thesis, paper or project, the first task is a literature review: what has been studied on your topic, what the field focuses on, and where a research gap lies. This guide explains what a literature review is, how to find a research gap, and how to do it in minutes with the Literature search tool.
What is a literature review?
A literature review is the systematic gathering, evaluation and summary of the existing academic work on a topic. It answers three questions: What is known in this field? Which methods have been used? What is still unanswered?A good review lays the foundation for your study's contribution (novelty) statement.
What is a research gap, and why does it matter?
A research gap is a question, method, population or context that is not yet sufficiently studied in the literature. Pointing to a clear gap and filling it is a precondition for any thesis or paper to be accepted. Common gap types:
- Question gap: Questions not asked or left unanswered.
- Method gap: Approaches untried or rarely used.
- Population/context gap: Under-represented groups, regions, settings.
- Intersection gap: Two well-studied topics rarely studied together.
- Contradiction gap: Areas where findings conflict and remain unresolved.
Step by step: a literature review with the tool
- Type your topic. On the Literature searchpage, write your topic freely (sloppy keywords are fine). Optionally use “Query suggestions” to turn your input into well-formed academic search phrases — this prevents careless queries from skewing the results.
- Search. The open academic database OpenAlexis scanned; the field's publications-per-year, prominent sub-topics, trend and most-cited sources appear within seconds.
- Get candidate gaps and sources. You see a summary of the field, candidate research gaps (tagged by grounding, with source references), data signals and a theme map. Select the sources you like and copy them as a bibliography in any citation style (APA 7, IEEE, Vancouver, TÜBİTAK, TÜSEB and 20+ CSL styles), or download the whole report as PDF.
How to read candidate gaps
Each candidate gap carries a colored label showing its grounding, so you can judge how far to trust it:
- From review:A gap explicitly stated in a review article's “future work” section — most reliable.
- From data: A signal found by counting (e.g. two topics rarely intersecting, a declining trend, a small theme cluster) — measurement, not interpretation.
- Inferred: Derived from abstracts, the most speculative category — always verify with your own domain knowledge.
The numbers next to each gap link to the supporting sources, so you get a traceable analysis instead of an unsourced claim.
Theme map and data signals
The tool turns the scanned publications into meaning vectors and clusters them into a theme map: the field's sub-themes with their share, median year and a representative paper. Small or stale themes are often the most promising gap candidates. A concept intersection signal also reveals topic pairs that are individually common but rarely studied together.
Tips for a better search
- Academic literature is mostly in English; English keywords return more results (the suggestion feature does this for you).
- Use “Last 5 years” for the current frontier, “Reviews only” for expert summaries.
- Click a sub-topic chip to narrow the search to that intersection and find more specific gaps.
- Read the result like a map: look at the whole field, not a single gap.
Literature search or citation checking?
They complement each other. Literature search is for findingnew sources and understanding a field. To find a specific academic's publications, use author search. If you already have a bibliography and want to verify whether the references are real and the DOIs resolve, use the citation checker. Practical flow: map the field and gather sources with literature search, then once your draft is done, re-check the whole bibliography with the pre-submission checklist.