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Narrative, systematic, and scoping reviews answer different kinds of questions, while meta-analysis is a statistical synthesis method rather than simply another review type. Learn how to choose an approach based on what you actually want to find out.
Read Guide →A literature review can be a section within a larger research project or a research project in its own right. A review article is a standalone scholarly publication whose central contribution comes from analyzing and synthesizing existing literature.
Read Guide →Systematic and scoping reviews both use structured methods, but they usually answer different kinds of questions. The right choice depends less on how broad your topic is than on what you want the review to accomplish.
Read Guide →Scoping and mapping reviews overlap substantially, but the terms are not universally interchangeable. Their meaning depends partly on the methodological tradition, so researchers should define the approach they are using rather than rely on the label alone.
Read Guide →A literature review becomes a research project of its own not when it reaches a particular number of papers or pages, but when the review has an independent question, defensible methodology, systematic analysis, and scholarly contribution that comes from synthesizing existing evidence.
Read Guide →There is no fixed number of years after which another review becomes justified. A recent review may still need updating or replacing if its question, methods, coverage, or evidence base no longer supports the answer researchers need.
Read Guide →Precision is valuable in a systematic review, but narrower is not automatically better. A question may become too narrow when its restrictions leave a synthesis that is technically answerable but unlikely to provide useful new knowledge.
Read Guide →Another literature review is not justified simply because the topic remains interesting. Before starting, determine whether a new synthesis could materially improve what researchers already know.
Read Guide →Finding a review on your topic does not necessarily mean your question has already been answered. Compare the actual questions, scope, evidence, methods, and applicability before deciding.
Read Guide →A topic can have several published reviews and still contain a meaningful review gap. The key is whether those reviews collectively resolve the question, not how many have been published.
Read Guide →An older review does not automatically need replacing simply because several years have passed. What matters is whether new evidence or methodological developments could meaningfully change what the review tells us.
Read Guide →A recent publication date does not guarantee a complete evidence synthesis. If a review's search could have missed consequential studies, its conclusions may not adequately answer the question.
Read Guide →Conflicting reviews can reveal an important unresolved problem, but disagreement alone does not automatically justify another synthesis. First determine why the reviews reached different conclusions.
Read Guide →The absence of a systematic review from your country does not automatically create a useful review gap. Geography matters when contextual differences could change the evidence, its applicability, or the decisions it informs.
Read Guide →Finding a gap in the literature does not automatically justify collecting new data. The existing evidence should show both a meaningful unresolved question and a credible reason why another study could reduce that uncertainty.
Read Guide →More studies do not always produce more understanding. Before collecting new data, determine whether the real problem is missing evidence or evidence that already exists but has not been adequately synthesized.
Read Guide →Not every unanswered question represents useful research uncertainty. A new study is most defensible when the literature leaves consequential uncertainty and the proposed design can realistically reduce it.
Read Guide →Previous studies having limitations does not automatically justify another study. The stronger question is whether your proposed design actually addresses the weaknesses that prevent the existing evidence from supporting a useful conclusion.
Read Guide →A population being previously unstudied does not automatically make it an important research gap. New population data matter when relevant differences could change the effect, interpretation, applicability, or decision supported by existing evidence.
Read Guide →An untested comparison is not automatically an important research gap. A new comparison matters when it answers a consequential question that existing comparisons cannot adequately answer.
Read Guide →Longer follow-up is useful only when additional time allows the study to observe something consequential that shorter studies cannot. Extending a study without a time-dependent research question may simply make it longer, not more informative.
Read Guide →Conflicting findings do not automatically justify another study. New research is most informative when it tests plausible reasons for the disagreement rather than simply contributing another estimate to the existing split.
Read Guide →A literature review is not supposed to guarantee that your original study survives. Sometimes the most defensible conclusion is to redesign, redirect, postpone, or abandon the study because the evidence shows that the original plan would add little.
Read Guide →Before looking for a research gap, identify what the literature already answers reasonably well. Learn how to recognize established answers without mistaking publication volume for evidential certainty.
Read Guide →Some research questions are neither answered nor untouched. Learn how to identify questions for which the literature resolves one part while leaving important populations, mechanisms, outcomes, contexts, or explanations uncertain.
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