เปรียบเทียบวิธี

	การวิจัยเชิงสำรวจตามช่วงเวลา	การประเมินโครงการ
สาขาวิชา	การออกแบบการวิจัย	วิธีการภาคสนาม
ตระกูล	Process / pipeline	Process / pipeline
ปีกำเนิด	Late 19th–early 20th century; methodologically codified through the 20th century	1960s–1970s (Scriven 1967; Stufflebeam CIPP model 1971)
ผู้ริเริ่ม	No single originator; foundational methodological treatments by Stuart Menard and Judith Singer & John Willett	Michael Scriven; Daniel Stufflebeam; Peter Rossi
ประเภท	Quantitative (or mixed) observational research design	Applied evaluation methodology
แหล่งต้นตำรับ	Menard, S. (2002). Longitudinal Research (2nd ed.). Sage Publications. ISBN: 978-0761922841	Rossi, P. H., Lipsey, M. W., & Freeman, H. E. (2004). Evaluation: A Systematic Approach (7th ed.). Sage. ISBN: 978-0761908944
ชื่อเรียกอื่น	longitudinal study, longitudinal design, prospective longitudinal study, repeated-measures observational study	evaluation research, program assessment, educational evaluation, systematic program evaluation
ที่เกี่ยวข้อง	4	3
สรุป	Longitudinal research is an observational design in which the same participants, groups, or units are measured repeatedly over an extended period. Rather than capturing a single snapshot, it tracks change, stability, and temporal sequencing of variables — making it the primary non-experimental strategy for studying development, growth, decline, and the unfolding of causal processes across time.	Program evaluation is a systematic, empirically grounded process of collecting and analyzing information about a program to determine its merit, worth, or significance. Applied across education, public health, social services, and policy, it addresses questions such as whether a program is reaching its target population, whether it is being implemented as designed, and whether it is producing the intended outcomes. It draws on both quantitative and qualitative methods and serves accountability, improvement, or knowledge-generation purposes.