เปรียบเทียบวิธี

	การศึกษาเฉพาะกรณีเชิงระยะยาว	การวิจัยเชิงปฏิบัติการ
สาขาวิชา	เชิงคุณภาพ	การวิจัยเชิงคุณภาพ
ตระกูล	Process / pipeline	Process / pipeline
ปีกำเนิด	1984 (Yin's foundational codification); longitudinal case methods in use since early 20th century	1946
ผู้ริเริ่ม	Robert K. Yin (systematic codification); roots in clinical and anthropological case tradition	Kurt Lewin; expanded by Kemmis, McTaggart, Reason & Bradbury
ประเภท	Qualitative research design	Method
แหล่งต้นตำรับ	Yin, R. K. (2018). Case Study Research and Applications: Design and Methods (6th ed.). Sage. ISBN: 978-1506336169	Lewin, K. (1946). Action research and minority problems. Journal of Social Issues, 2(4), 34–46.
ชื่อเรียกอื่น	single-case longitudinal design, in-depth longitudinal case study, idiographic longitudinal study, LSCS	Participatory Action Research, PAR, Collaborative Inquiry
ที่เกี่ยวข้อง	6	1
สรุป	A longitudinal single case study is a qualitative research design that follows one bounded unit — a person, organization, program, or community — through multiple points in time. Unlike a cross-sectional snapshot, it captures how phenomena develop, shift, or respond to events across months or years, combining the contextual richness of case study methodology with the temporal depth needed to understand process and change.	Action research is a collaborative research methodology in which researchers work with practitioners and community members to investigate a problem, implement change, and evaluate outcomes, cycling through reflection, action, and learning. Developed by Kurt Lewin (1946), action research bridges research and practice, aiming simultaneously to produce knowledge and practical improvement.