How to Write a Literature Review Conclusion

A literature review conclusion has one job that most drafts fail to do: it has to state, in the author’s own voice, what the body of literature collectively shows — not what each source individually said. Searchers landing on “literature review conclusion example” are almost always stuck at exactly this point, having written a competent body of thematic paragraphs and then defaulted, in the closing section, back into a list — a final recap of sources rather than a synthesized close.

This guide covers the conclusion section specifically: what it needs to accomplish, how to build a defensible gap statement out of it, how a standalone review’s conclusion differs from a review chapter’s, and a usable structural pattern with annotated weak-vs-strong examples. For the review’s body — organizing sources thematically, chronologically, or methodologically, and the synthesis-vs-summary distinction applied throughout — see CASRAI’s guide to writing a literature review. For worked examples of body paragraphs at different scales, see literature review examples. For the dissertation-length version of this section, see the literature review chapter of a dissertation.

What the Conclusion Must Do: Synthesis, Not Summary

The distinction that separates a strong literature review conclusion from a weak one is the same distinction that governs the body of the review, applied one more time at the highest level of the whole document.

Summary restates what each source, or each theme, said — a compressed recap of the review’s own contents: “This review examined cost, complexity, and provider relationships as explanations for medication nonadherence.” That sentence is accurate, but it does no new work; a reader who already read the review learns nothing from it.

Synthesis states what the body of literature, taken together, actually shows: where the sources agree, where they conflict, what pattern holds across studies that no single study states on its own, and what that pattern means. A synthesized conclusion sentence looks more like: “Across these three explanations, cost and complexity have been tested independently but never against each other in the same sample, which is why it remains unclear whether either effect holds once the other is controlled for.” That sentence could not be produced by summarizing each theme in turn — it requires holding the whole review in view at once and stating a relationship between its parts.

Most student and early-career conclusions fail here specifically: they summarize the review’s own structure instead of synthesizing its findings. A practical check while drafting: if a sentence in the conclusion could be deleted without losing anything a reader couldn’t get by skimming the section headings, it is summary, not synthesis.

The Gap Statement: From “What Is Known” to “What Isn’t”

The gap statement is the hinge the whole conclusion turns on. It is the sentence, or short passage, that moves the reader from “here is what the literature establishes” to “and here is the specific thing it does not yet establish” — and that gap has to connect directly to the research question, thesis, or study that follows the review, not float as a general observation about the field.

A real gap is usually one of a small number of recognizable types:

• An unresolved conflict. Two or more strands of evidence disagree, and no study has directly reconciled them — e.g., cross-sectional and longitudinal designs producing different effect sizes for the same relationship.
• An untested population, context, or boundary condition. The mechanism is established in one setting but has not been tested where a theoretically relevant difference exists — not merely “a different place,” but a place or population where the underlying theory gives a specific reason to expect the finding might not hold.
• A methodological limitation shared across the existing evidence. Every available study uses a design that cannot rule out a specific alternative explanation (self-selection, recall bias, a cross-sectional design that cannot establish direction of causation), and no study has yet used a design capable of doing so.
• Factors studied in isolation that plausibly interact. Each factor has been examined on its own, but never in combination, and there is a specific reason — stated in the review’s own synthesis — to expect they don’t operate independently.

A gap is not real just because it is phrased as a gap. The most common fake-gap pattern is a narrow, contextual restatement with no theoretical stakes: “no study has examined this specific effect in [my institution / my country / my industry].” That sentence describes an absence, but doesn’t explain why the absence matters — a reviewer’s or committee’s next question is always “so what would we learn that we don’t already know?” A defensible gap statement answers that question in the same breath it names the gap: not just that something hasn’t been studied, but what specifically remains unresolved because it hasn’t been.

Standalone Review vs. Review Chapter: Two Different Conclusions

A literature review’s conclusion has to do a different job depending on what kind of document it sits inside — and conflating the two is a common source of a conclusion that reads as oddly incomplete either way.

• A standalone review (a review published as its own journal article, or the literature-review section folded into a paper’s introduction with no separate methodology chapter following it) has to close on its own. Its conclusion should synthesize the field’s state, name open questions, and state their implications — for practice, for theory, for future research generally — because there is no subsequent chapter to hand off to. It is the last word the reader gets on this specific topic.
• A review chapter in a thesis or dissertation has one additional, non-optional job: it must hand off explicitly to the methodology chapter that follows. Its conclusion states the gap, then states the specific research question(s) the dissertation will answer and, briefly, the kind of approach that follows from that gap — without pre-empting the full methodology chapter’s detail. A chapter conclusion that closes only on general implications, the way a standalone review would, leaves the handoff to the next chapter undone and reads as if the chapter doesn’t know what comes after it.

Competing how-to content frequently gives one generic conclusion template for both cases. They are not interchangeable: a standalone review’s conclusion is the end of the argument, while a review chapter’s conclusion is a pivot into the next one.

A Structure You Can Use

The following pattern covers both a standalone review’s conclusion and a thesis chapter’s, with the last element adjusted for which one applies:

1. Restate scope and purpose, briefly. One or two sentences reminding the reader what the review set out to examine — not a re-introduction, just enough to reorient after a long body section.
2. Synthesize the major themes and how they relate to each other. The core of the conclusion: what the review’s themes collectively show, where they reinforce each other, and where they pull in different directions. This is where the synthesis-vs-summary distinction above matters most.
3. State the conflicts and limitations in the existing evidence. Name the specific disagreements or methodological constraints identified across the body of the review — this is the raw material the gap statement is built from.
4. State the gap. One clear, specific statement of what remains unresolved, built from step 3, not asserted independently of it.
5. State the implications — and, for a chapter, the handoff. A standalone review closes with what the gap means for the field, for practice, or for future research generally. A dissertation or thesis chapter closes with the specific research question(s) the current work will address and a brief indication of the approach that follows, connecting directly into the methodology chapter.

Weak vs. Strong Conclusion: Annotated Illustrative Example

Weak: Summary Restated as a Conclusion

This review examined research on remote-work productivity. Author A and Author B found that reduced commuting and fewer interruptions improved productivity. Author C found that selection effects, not remote work itself, explained productivity gains. Author D noted that most datasets do not distinguish voluntary from mandated remote work. More research is needed in this area.

Why it’s weak: each sentence just restates a finding already covered in the body, in the same order the body covered it — a reader learns nothing they couldn’t get from re-skimming the section headings. The closing sentence, “more research is needed,” names no gap at all: it doesn’t say what is unresolved or why it matters.

Strong: Synthesized Conclusion With a Real Gap

Across this literature, two competing explanations for remote-work productivity gains — reduced interruption and pre-existing selection effects — have been developed and tested largely in isolation from each other, and neither has been tested using a design that separates them. Every study reviewed here relies on voluntary remote-work arrangements, which means the selection-effects explanation can never be fully ruled out using the available evidence: employees who choose remote work may simply differ systematically from those who don’t. This leaves a specific methodological gap rather than a general one — not “more research on remote work,” but research using a context in which remote work is mandated rather than chosen, which would allow the selection-effects explanation to be tested independently for the first time.

Why it’s strong: it states a relationship between the two explanations the body established separately, names the shared methodological limitation across the whole literature (voluntary-only samples), and turns that limitation directly into a specific, testable gap — not a vague call for “more research.” A dissertation chapter would follow this same paragraph with the specific research question and a one-sentence preview of the study design that addresses it; a standalone review would instead close by stating what resolving this gap would mean for organizations designing remote-work policy.

How Long Should a Literature Review Conclusion Be?

There’s no fixed length, and requirements vary meaningfully by institution, journal, and the review’s own scale — check specific guidelines before assuming a rule of thumb applies. As a rough proportion, a conclusion is usually a small fraction of the review’s total length: a few paragraphs for a review folded into a journal article’s introduction or discussion, and a longer, more developed closing section — sometimes several pages — for a full dissertation chapter, since a thesis conclusion is doing the additional, non-optional work of handing off to the methodology chapter. What should scale with the review’s length is not the conclusion’s word count so much as how many distinct themes and conflicts it has to synthesize; a longer review with more sub-literatures usually needs a proportionately longer synthesis to do that work honestly, even if the underlying structure — restate, synthesize, state limitations, state the gap, state implications — stays the same.

Common Failures

• Introducing new sources in the conclusion. The conclusion synthesizes what the body already established; a citation appearing for the first time in the conclusion is a sign that source belonged in the body, not evidence for a new closing claim.
• Hedging so heavily that no actual claim is made. “The literature suggests there may possibly be some relationship, though further research would be needed to confirm this” states nothing a reader can act on. A strong conclusion is precise about what is and isn’t established, including openly stating disagreement where it exists — it doesn’t need to overstate certainty to be clear.
• Listing themes or sources one by one instead of synthesizing. The weak-example pattern above — the conclusion doing the same summarizing work as the body, just compressed.
• Omitting the gap entirely. A conclusion that describes the field thoroughly but never narrows to a specific unresolved question leaves the reader to guess why the review, or the study that follows it, was necessary at all.
• Treating a standalone review’s and a chapter’s conclusion as interchangeable. See the section above — a chapter conclusion that never states the research question it hands off to leaves that handoff undone.

Frequently Asked Questions

What should a literature review conclusion include?

A restatement of the review’s scope, a synthesis of its major themes and how they relate to each other, the conflicts or limitations visible across the existing evidence, an explicit gap statement, and a statement of implications — general implications for a standalone review, or the specific research question and approach for a dissertation chapter. See the structure section above.

What’s the difference between a summary and a synthesis in a literature review conclusion?

A summary restates what each source or theme said, in the order the review covered it. A synthesis states what the sources collectively show — agreement, conflict, and pattern — in a claim none of the individual sources or themes makes on its own. See the annotated weak-vs-strong example above.

Do you cite sources in a literature review conclusion?

Existing citations already used in the body can be referenced again briefly to support a synthesized claim, but a source appearing for the first time in the conclusion is usually a sign it belongs in the body instead — the conclusion’s job is to synthesize evidence already presented, not to introduce new evidence.

How is a review chapter’s conclusion different from a standalone review’s conclusion?

A standalone review’s conclusion closes on general implications, because there’s no subsequent chapter to hand off to. A dissertation or thesis chapter’s conclusion has an additional job: it must state the specific research question(s) the gap leads to and pivot explicitly into the methodology chapter that follows. See the section above for the full distinction.

How long should a literature review conclusion be?

There’s no fixed length — requirements vary by institution and journal, and a rough guide is that it should be a small proportion of the review’s total length, scaling with how many themes and conflicts it has to synthesize rather than to a fixed word count. See the length section above.

Related CASRAI Resources

• How to Write a Literature Review — the full process: structure, organizing patterns, and synthesis-vs-summary craft for the review’s body.
• Literature Review Examples — annotated body-paragraph examples at different scales.
• The Literature Review Chapter of a Dissertation — the full-chapter version this conclusion pattern extends.
• Literature Review vs. Systematic Review vs. Scoping Review
• What Is a Dissertation?
• Citation Styles and Referencing Formats
• Narrative Review and Scoping Review
• Scholarly Writing pillar