เปรียบเทียบวิธี

	การสัมภาษณ์กึ่งโครงสร้างแบบระยะยาว	การสำรวจแบบระยะยาว
สาขาวิชา	ระเบียบวิธีสำรวจ	ระเบียบวิธีสำรวจ
ตระกูล	Process / pipeline	Process / pipeline
ปีกำเนิด	1990s–2000s (as explicit methodology)	1940s (panel survey tradition); longitudinal designs codified mid-20th century
ผู้ริเริ่ม	Rooted in longitudinal qualitative research traditions; systematised by Johnny Saldana and Rachel Thomson & Janet Holland	Established tradition; formalized in social science by Paul Lazarsfeld and colleagues (1940s panel studies)
ประเภท	Qualitative longitudinal data collection technique	Quantitative / mixed-methods survey design
แหล่งต้นตำรับ	Saldana, J. (2003). Longitudinal Qualitative Research: Analyzing Change Through Time. AltaMira Press. ISBN: 978-0759100480	Menard, S. (2002). Longitudinal Research (2nd ed.). Sage Publications. ISBN: 978-0761922292
ชื่อเรียกอื่น	LSI, repeated semi-structured interview, panel qualitative interview, longitudinal qualitative interview	panel survey, repeated-measures survey, longitudinal panel study, wave survey
ที่เกี่ยวข้อง	6	3
สรุป	A longitudinal semi-structured interview study collects open-ended, guided interview data from the same participants across multiple time points. By returning to the same individuals — weeks, months, or years apart — researchers can trace how experiences, perceptions, and meanings change over time. The approach blends the flexibility of qualitative inquiry with the temporal depth that is impossible in a one-shot design, making it a cornerstone method in qualitative longitudinal research.	A longitudinal survey collects structured questionnaire data from the same individuals or units at two or more distinct points in time. By tracking the same respondents across waves, researchers can distinguish genuine change from stable individual differences, establish temporal ordering between variables, and model trajectories of attitudes, behaviors, or outcomes in ways that a single cross-sectional snapshot cannot support.