เปรียบเทียบวิธี

	การรวบรวมเอกสารแบบสามเส้า	การวิเคราะห์เนื้อหา
สาขาวิชา	ระเบียบวิธีสำรวจ	เชิงคุณภาพ
ตระกูล	Process / pipeline	Process / pipeline
ปีกำเนิด	1978 (triangulation); 2009 (document analysis as method)	Systematised through Krippendorff's methodology work; 4th edition 2018
ผู้ริเริ่ม	Norman K. Denzin (triangulation principle); Glenn Bowen (document analysis formalization)	Klaus Krippendorff (systematic formulation); roots in early 20th-century communications research
ประเภท	Qualitative/mixed-methods data collection strategy	Qualitative / mixed-method research technique
แหล่งต้นตำรับ	Denzin, N. K. (1978). The Research Act: A Theoretical Introduction to Sociological Methods (2nd ed.). McGraw-Hill.	Krippendorff, K. (2018). Content Analysis: An Introduction to Its Methodology (4th ed.). Sage. ISBN: 978-1506395661
ชื่อเรียกอื่น	documentary triangulation, multi-source document collection, cross-source document analysis, data triangulation via documents	İçerik Analizi, systematic content coding, quantitative content analysis
ที่เกี่ยวข้อง	4	5
สรุป	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.	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.