เปรียบเทียบวิธี

	กลยุทธ์การสืบค้นอย่างเป็นระบบ	การสืบค้นเอกสารเทา
สาขาวิชา	ทักษะการวิจัย	ทักษะการวิจัย
ตระกูล	Process / pipeline	Process / pipeline
ปีกำเนิด	1990s (formalized in Cochrane methodology)	1990s (formalized in systematic review guidelines)
ผู้ริเริ่ม	Cochrane Collaboration and systematic review methodologists	Information specialists and systematic review methodologists (Cochrane Collaboration, Health Technology Assessment)
ประเภท	Framework	Tool
แหล่งต้นตำรับ	Moher, D., Liberati, A., Tetzlaff, J., & Altman, D. G. (2009). Preferred Reporting Items for Systematic Reviews and Meta-Analyses: The PRISMA statement. PLoS Medicine, 6(7), e1000097.	Rothstein, H. R., & Hopewell, S. (2009). Grey literature. In J. P. Higgins & S. Green (Eds.), Cochrane handbook for systematic reviews of interventions (Version 5.0.2, Chapter 13). The Cochrane Collaboration.
ชื่อเรียกอื่น	search protocol, systematic search, comprehensive search strategy	grey literature, gray literature, unpublished literature
ที่เกี่ยวข้อง	3	3
สรุป	A systematic search strategy is a comprehensive, transparent protocol for retrieving all relevant literature addressing a well-defined research question. Developed by the Cochrane Collaboration and formalized in guidelines like PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyses), systematic search strategies are essential for conducting unbiased literature reviews, systematic reviews, and meta-analyses. Unlike ad hoc searches (searching Google Scholar or PubMed without a protocol), systematic searches document every step—which databases were searched, what search terms were used, how many results were retrieved, and what inclusion/exclusion criteria were applied—enabling other researchers to reproduce the search and verify that no relevant studies were missed.	Grey literature comprises documents and data not published through conventional commercial channels—including theses, government reports, clinical trial registries, conference abstracts, organizational policy documents, and working papers. Unlike journal articles, grey literature is not indexed in MEDLINE or Scopus and often lacks peer review. However, it is crucial for systematic reviews because it may contain null or negative findings that are less likely to be published (publication bias). Systematic grey literature searching is now a standard component of evidence synthesis and is recommended by the Cochrane Collaboration, PRISMA, and other methodological guidelines.