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Changing search terms after seeing initial results is not automatically biased. Literature searching is often iterative, but revisions can introduce confirmation bias when they increasingly retrieve evidence that supports an emerging conclusion while neglecting plausible alternatives.
Read Guide →Literature searches often evolve as researchers learn the terminology and structure of a field. Good reporting does not require pretending otherwise: preserve what changed, when it changed, why it changed, and how the final search was conducted.
Read Guide →When the literature contradicts what you expected, the goal is not to defend your original assumption. Examine why the evidence conflicts with it and decide whether your assumption, question, or study needs to change.
Read Guide →A research problem should not survive simply because you have already designed a study around it. If the literature suggests the problem may not exist, verify what the evidence actually establishes before deciding whether to narrow, reframe, or abandon the idea.
Read Guide →When existing evidence suggests the effect you expected may be absent, do not automatically search for a way to preserve the prediction. Determine how strongly the literature rules out a meaningful effect and whether a better research question remains.
Read Guide →Evidence that an intervention is unlikely to work should change more than the wording of your rationale. Determine whether the intervention itself, its mechanism, its implementation, or the conditions required for success need reconsideration.
Read Guide →A theory should not be protected simply because it was your preferred framework when the study began. When the literature exposes weak predictions, limited evidence, or stronger alternatives, reconsider what role the theory should play.
Read Guide →The strongest evidence for your research question may sit outside the literature your discipline usually reads. Use it when it genuinely bears on the question, while examining whether its concepts, methods, populations, and assumptions transfer to your context.
Read Guide →A research question is not a contract you must preserve when the literature changes what you know. Revise it when the original question rests on weakened assumptions or no longer addresses meaningful uncertainty, but make the change transparently rather than chasing favorable results.
Read Guide →Finding previous studies on your question does not automatically make your research unnecessary. The real issue is whether meaningful uncertainty remains and whether your proposed study could add evidence that changes what is known.
Read Guide →Contradictory findings can make new research especially valuable when the disagreement represents consequential uncertainty that a better study can resolve. First determine whether the contradiction is real, important, and scientifically explainable.
Read Guide →A question can remain unanswered even when several studies have examined it. The important task is to identify exactly how weak evidence limits the conclusions researchers can reasonably draw.
Read Guide →Conflicting findings do not simply mean that researchers need one more study. Learn how to identify the question hidden inside inconsistent evidence and investigate why results differ.
Read Guide →A field can produce many studies while repeatedly comparing the same options. Learn how to identify unanswered questions hidden behind familiar comparison groups.
Read Guide →Not every unanswered question can be solved by another study. Learn how to distinguish missing evidence from limits in what current methods can realistically establish.
Read Guide →At some point, another literature search adds less value than a well-designed study. Learn how to decide when an unanswered question is sufficiently established to become a research problem.
Read Guide →You will probably never find every paper related to your topic. Learn how to decide when a literature search is sufficiently complete by looking for diminishing returns, conceptual coverage, recurring evidence, unresolved gaps, and the requirements of your review method.
Read Guide →You usually cannot prove that you found every relevant paper. What you can do is design, test, document, and cross-check your search well enough to make missing important literature reasonably unlikely.
Read Guide →Literature saturation is the point at which further searching contributes little that is substantively new to the purpose of your review. It is a useful stopping concept, but its meaning depends on what your review is trying to achieve.
Read Guide →New papers may still be worth finding even after your main understanding has stabilized. The useful question is whether they continue to add concepts, evidence, contradictions, or distinctions that materially change your synthesis.
Read Guide →A literature search should test and refine your understanding, not end as soon as enough supportive studies have accumulated. Contradictory and qualifying evidence may be precisely what makes your argument defensible.
Read Guide →Contradictory papers do not necessarily mean your argument has collapsed. They may expose methodological differences, boundary conditions, competing explanations, or genuine uncertainty that your literature review needs to explain.
Read Guide →More searching is useful only while it continues to improve the review. A defensible stopping point emerges when appropriate additional searches produce progressively less relevant information and are unlikely to change the synthesis materially.
Read Guide →There is no universal number of sources that makes a thesis, dissertation, or research paper sufficiently researched. The right amount depends on the question, scope, discipline, document type, and whether the literature adequately supports the work you need to do.
Read Guide →A literature search should be updated when enough time or change has occurred that new research could materially affect the review. The appropriate timing depends on the review method, pace of the field, stage of the project, and consequences of missing new evidence.
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