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Specialized databases can reveal literature, terminology, indexing, and document types that broad multidisciplinary databases may not capture as effectively. Learn when your research question warrants searching them.
Read Guide →One database can sometimes be enough for a focused research task, but there is no universal one-database rule. Whether it is defensible depends on the review purpose, subject coverage, evidence sought, and consequences of missing relevant studies.
Read Guide →Trial registries can reveal ongoing, completed, terminated, and sometimes unpublished trials that journal databases may not identify. They are particularly important for systematic reviews of interventions and questions involving clinical trials.
Read Guide →Registration extends beyond conventional clinical trials. Depending on your field and question, other study registries and preregistration systems may reveal planned, ongoing, completed, or otherwise difficult-to-discover research.
Read Guide →Thousands of search results do not necessarily mean your search has failed. Diagnose why the search is broad, then improve precision through better terms, concept structure, fields, phrases, proximity, or justified limits without quietly changing the research question.
Read Guide →A high citation count shows that a paper has attracted substantial scholarly attention, but it does not automatically prove quality, importance, or relevance. Learn what citations can tell you, what they cannot, and how to interpret them responsibly.
Read Guide →“Related articles” and “similar papers” can uncover useful research from a single relevant paper, but similarity is algorithmic rather than a guarantee of relevance. Learn how these tools work, what they can find, and when you should use them cautiously.
Read Guide →The paper with the most citations is not necessarily the paper that introduced an idea. Citation prominence reflects how later scholarship uses a publication, while intellectual priority requires tracing and verifying where the contribution actually originated.
Read Guide →Do not assume that a cited paper supports the claim attached to it. Retrieve the original source, locate the relevant passage, examine its context and evidence, and compare what the paper actually concludes with what later authors say it concluded.
Read Guide →You do not need to repeat the same literature searches every week to stay current. Build a monitoring system using saved searches, database alerts, citation alerts, journal notifications, and a short routine for reviewing what arrives.
Read Guide →Newer research is not automatically more important than older research. An older study may deserve priority when it established an idea, provides uniquely relevant evidence, documents an earlier period, or remains central to the evidence base.
Read Guide →A preprint can give you early access to important research, but being new does not make it important or reliable. Evaluate its relevance, methods, evidence, transparency, version history, and publication status before deciding how much attention it deserves.
Read Guide →Continuous literature monitoring is justified when important new evidence appears frequently enough that waiting for occasional search updates could affect research or decisions. It should be systematic and sustainable, not literally constant.
Read Guide →Grey literature includes research and other evidence produced outside conventional academic and commercial publishing. Learn what counts as grey literature and when searching for it can materially improve a literature review.
Read Guide →Government and institutional reports can contain valuable research evidence, including surveys, evaluations, administrative analyses, and technical studies. Their authority as documents, however, should not be confused with the methodological strength of the evidence they contain.
Read Guide →A report does not become unreliable simply because it was never peer reviewed, but you cannot assume that someone else has checked it for you. Evaluate its provenance, methods, data, transparency, potential bias, and the strength of the claims it actually supports.
Read Guide →Preprints can provide timely access to research before journal peer review, particularly in rapidly developing fields. Whether you should include them depends on your review purpose, eligibility criteria, and how carefully you manage their provisional and versioned status.
Read Guide →Government consultations can expose research, administrative data, expert evidence, and organizational knowledge that never reaches academic journals. Their usefulness depends on what the document contains and how critically you evaluate it.
Read Guide →Technical reports can provide methodological and implementation detail that a journal article compresses or omits. More detail is useful, but it does not automatically make the report more rigorous.
Read Guide →Some organizations conduct substantial research but rarely publish it in academic journals. Finding their work requires searching organizations, repositories, websites, references, and research networks rather than relying only on bibliographic databases.
Read Guide →Negative and null studies can be disproportionately difficult to find because some never reach journals. Finding them requires tracing studies independently of their results through registries, grants, reports, organizations, references, and researcher contact.
Read Guide →Searching for unpublished evidence can reduce important blind spots, but the search cannot continue indefinitely. The appropriate effort depends on the review question, risk of missing evidence, likely value of additional searching, and available resources.
Read Guide →Local and internationally indexed journals may differ in visibility, audience, and external vetting, but those differences should not become shortcuts for judging individual studies. Evaluate journal practices and study quality separately.
Read Guide →Local evidence may be distributed across theses, government reports, institutional repositories, technical documents, and other grey literature rather than conventional journals. Finding it requires searching the organizations and systems that produce the evidence, not only bibliographic databases.
Read Guide →A language barrier does not automatically make an important research source unusable. Translation tools can help you determine relevance and sometimes understand substantial portions of a paper, but important methodological, numerical, or interpretive claims may require verification by a fluent reader or reliable human translation.
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