手法を比較

	複数ソース文書収集	文書収集
分野	調査方法論	調査方法論
系統	Process / pipeline	Process / pipeline
提唱年	1970s–2000s (systematic articulation)	19th–20th century historical methods; contemporary social-science codification c. 2000s
提唱者	Rooted in qualitative documentary traditions; codified in mixed-methods and triangulation literature (Denzin 1970s; Bowen 2009)	Rooted in historical and social science traditions; systematized by Lindsay Prior and Glenn Bowen
種類	Data collection strategy	Qualitative / mixed data-collection technique
原典	Bowen, G. A. (2009). Document analysis as a qualitative research method. Qualitative Research Journal, 9(2), 27–40.	Bowen, G. A. (2009). Document analysis as a qualitative research method. Qualitative Research Journal, 9(2), 27–40.
別名	multi-source documentary research, multiple-document data collection, multi-site document analysis, cross-source document gathering	document analysis, documentary method, document review, secondary document analysis
関連	3	3
概要	Multi-source document collection is a data-gathering strategy in which researchers systematically locate, retrieve, and compare documents drawn from two or more independent sources — such as government archives, institutional records, media outlets, organisational reports, or digital repositories. By assembling evidence from diverse provenance, researchers can triangulate findings, detect discrepancies, and build a richer, more credible picture of the phenomenon under study than any single documentary source can provide.	Document collection is a systematic data-collection technique in which the researcher gathers and reviews existing written, visual, or digital records — such as reports, meeting minutes, policies, letters, photographs, or institutional records — as primary or supplementary evidence. It is widely used in qualitative, historical, and mixed-methods research and can stand alone or complement interviews and observation.