เปรียบเทียบวิธี

	การสัมภาษณ์เชิงลึกแบบสามเส้า	การรวบรวมเอกสารแบบสามเส้า
สาขาวิชา	ระเบียบวิธีสำรวจ	ระเบียบวิธีสำรวจ
ตระกูล	Process / pipeline	Process / pipeline
ปีกำเนิด	1978 (triangulation framework); in-depth interviewing ~1950s onward	1978 (triangulation); 2009 (document analysis as method)
ผู้ริเริ่ม	Norman K. Denzin (triangulation framework); in-depth interviewing practice is longstanding in qualitative research	Norman K. Denzin (triangulation principle); Glenn Bowen (document analysis formalization)
ประเภท	Qualitative data collection approach	Qualitative/mixed-methods data collection strategy
แหล่งต้นตำรับ	Denzin, N. K. (1978). The Research Act: A Theoretical Introduction to Sociological Methods (2nd ed.). McGraw-Hill.	Denzin, N. K. (1978). The Research Act: A Theoretical Introduction to Sociological Methods (2nd ed.). McGraw-Hill.
ชื่อเรียกอื่น	triangulated IDI, multi-source in-depth interview, triangulated qualitative interview, converging in-depth interview	documentary triangulation, multi-source document collection, cross-source document analysis, data triangulation via documents
ที่เกี่ยวข้อง	4	4
สรุป	Triangulated in-depth interviewing applies Denzin's triangulation logic to the in-depth interview method by deliberately combining multiple sources of convergent evidence — different informants, interviewers, time points, or corroborating data types — to strengthen confidence in qualitative findings. Rather than relying on a single interview account, the researcher gathers rich, open-ended accounts from several vantage points and cross-checks them for consistency and divergence, treating agreement as corroboration and disagreement as analytically meaningful.	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.