手法を比較

	トライアンギュレーションされた文書収集	複数ソース文書収集
分野	調査方法論	調査方法論
系統	Process / pipeline	Process / pipeline
提唱年	1978 (triangulation); 2009 (document analysis as method)	1970s–2000s (systematic articulation)
提唱者	Norman K. Denzin (triangulation principle); Glenn Bowen (document analysis formalization)	Rooted in qualitative documentary traditions; codified in mixed-methods and triangulation literature (Denzin 1970s; Bowen 2009)
種類	Qualitative/mixed-methods data collection strategy	Data collection strategy
原典	Denzin, N. K. (1978). The Research Act: A Theoretical Introduction to Sociological Methods (2nd ed.). McGraw-Hill.	Bowen, G. A. (2009). Document analysis as a qualitative research method. Qualitative Research Journal, 9(2), 27–40.
別名	documentary triangulation, multi-source document collection, cross-source document analysis, data triangulation via documents	multi-source documentary research, multiple-document data collection, multi-site document analysis, cross-source document gathering
関連	4	3
概要	Triangulated document collection is a qualitative data collection strategy in which documents from multiple independent sources are gathered and cross-checked against one another. By drawing on different document types — such as official records, personal archives, institutional reports, and media artifacts — the researcher reduces reliance on any single source and strengthens the credibility of the evidence base. The approach applies Denzin's data triangulation principle directly to documentary material.	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.