手法を比較

	複数ソース文書収集	コンテンツ分析
分野	調査方法論	質的手法
系統	Process / pipeline	Process / pipeline
提唱年	1970s–2000s (systematic articulation)	Systematised through Krippendorff's methodology work; 4th edition 2018
提唱者	Rooted in qualitative documentary traditions; codified in mixed-methods and triangulation literature (Denzin 1970s; Bowen 2009)	Klaus Krippendorff (systematic formulation); roots in early 20th-century communications research
種類	Data collection strategy	Qualitative / mixed-method research technique
原典	Bowen, G. A. (2009). Document analysis as a qualitative research method. Qualitative Research Journal, 9(2), 27–40.	Krippendorff, K. (2018). Content Analysis: An Introduction to Its Methodology (4th ed.). Sage. ISBN: 978-1506395661
別名	multi-source documentary research, multiple-document data collection, multi-site document analysis, cross-source document gathering	İçerik Analizi, systematic content coding, quantitative content analysis
関連	3	5
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.	Content analysis is a systematic research technique for reducing text, visual, or media material into coded categories so that patterns can be counted, compared, and interpreted. Formalised by Klaus Krippendorff in his widely cited methodology textbook (latest edition 2018), the method sits at the boundary of qualitative and quantitative inquiry: it imposes structured, replicable coding on inherently meaning-laden material.