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Not every literature search needs to be systematic. The appropriate level of rigor depends on what the search is supposed to accomplish, how the literature will be used, and how strongly your conclusions depend on identifying the relevant evidence.
Read Guide →Systematic, reproducible, and comprehensive describe different qualities of literature searching. A search can be reproducible without being comprehensive, systematic without achieving perfect coverage, or extensive without being sufficiently documented to reproduce.
Read Guide →There is no universal number of databases, papers, or search results that makes a literature search good enough. Adequacy depends on the study, the role the literature plays in it, and whether the search can support the claims you intend to make.
Read Guide →You do not need systematic-review-level documentation for every literature search, but keeping a proportionate record can make your research easier to revisit, update, explain, and defend.
Read Guide →A journal article needs enough literature searching to support its claims and position its contribution accurately, but not every article requires an exhaustive search. The appropriate depth depends on what the paper is trying to establish.
Read Guide →A systematic review search should be comprehensive enough to make missing eligible evidence unlikely and reproducible enough for readers to understand what was searched. Thoroughness depends on the review question and eligible evidence, not a universal number of databases.
Read Guide →A research gap is a claim about what the existing literature does not adequately know or explain, so it requires more than failing to find a paper in an initial search. Search broadly enough to test the proposed gap against alternative terminology, evidence, and explanations.
Read Guide →A reproducible search becomes necessary when literature retrieval is part of the research method or when important conclusions depend on what the search did and did not find. Reproducibility requires more than listing databases and keywords.
Read Guide →A librarian-designed search is particularly valuable when missing relevant evidence could affect a systematic review, strong absence claim, high-stakes research decision, or complex interdisciplinary search. Not every literature search requires specialist design.
Read Guide →A practical step-by-step guide to searching the research literature effectively. Learn how to turn a research question into a reproducible search strategy, choose databases, find search terms, refine results, and document what you did.
Read Guide →Your first literature search usually should be broad enough to reveal the terminology and shape of the literature, but not so broad that the results become meaningless. Learn how to find a useful starting point and refine it deliberately.
Read Guide →Thousands of results do not automatically mean your literature search is too broad. Learn how to diagnose excessive irrelevant retrieval and narrow a search without unnecessarily losing relevant studies.
Read Guide →A small result set does not necessarily mean your literature search is too narrow. Learn how to detect when restrictions, missing terminology, or excessive concept blocks are causing relevant studies to disappear.
Read Guide →Peer review can be useful when evaluating research, but restricting a literature search to peer-reviewed publications can exclude relevant evidence. Learn when broader searching matters and how to decide what should ultimately be included.
Read Guide →A literature search is difficult to reproduce if you record only the keywords or database names. Learn what to save while searching so the strategy can later be reported, checked, updated, and rerun.
Read Guide →Strict search criteria can make results look cleaner while quietly excluding studies that matter. The goal is not to remove every irrelevant record but to retrieve the relevant evidence with acceptable screening burden.
Read Guide →A broad search can protect against missing evidence, but breadth has costs. When the search or underlying eligibility criteria become too broad, irrelevant retrieval and substantive heterogeneity can make the literature difficult to screen, compare, and interpret.
Read Guide →A search strategy should usually be tested before it becomes your final search. Piloting can reveal missing terminology, faulty Boolean logic, excessive noise, and known relevant studies that your planned strategy fails to retrieve.
Read Guide →A known relevant paper can act as a diagnostic test for your planned search. If the strategy cannot retrieve a study that should fit its scope, investigate why before assuming the search is ready.
Read Guide →A missing key paper is a warning worth investigating, not automatic proof that your search has failed. Diagnose whether the problem comes from database coverage, terminology, indexing, search logic, or an unnecessary restriction before changing the strategy.
Read Guide →Google Scholar and Google search different information environments. Learn when Google Scholar is better for scholarly literature, when regular Google is more useful, and how researchers can use both strategically.
Read Guide →Google Scholar is an excellent scholarly discovery tool, but whether it is enough depends on the purpose and rigor of your literature review. Learn when to use it alone, when to supplement it, and why search coverage matters more than the number of databases searched.
Read Guide →Your university library's main search box can be an excellent starting point for finding books, articles, and other resources, but it does not necessarily search everything your library provides. Learn when discovery systems are useful and when individual databases are the better choice.
Read Guide →Preprint servers can reveal recent research before journal publication, but preprints have usually not completed formal peer review. Learn when searching them adds value and how to use their findings responsibly.
Read Guide →Theses and dissertations can reveal detailed studies, emerging research, negative or unpublished findings, and extensive references that journal databases may miss. Whether you should search them depends on your research question and review methodology.
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