So sánh phương pháp

	Nghiên cứu tình huống theo chiều dọc	Nghiên cứu hành động
Lĩnh vực	Định tính	Nghiên cứu định tính
Họ	Process / pipeline	Process / pipeline
Năm ra đời	1984–1990 (foundational methodological codification)	1946
Người khởi xướng	Robert K. Yin (case study methodology); Andrew M. Pettigrew (longitudinal field research)	Kurt Lewin; expanded by Kemmis, McTaggart, Reason & Bradbury
Loại	Qualitative research design	Method
Công trình gốc	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.
Tên gọi khác	longitudinal case research, panel case study, repeated case study, temporal case study	Participatory Action Research, PAR, Collaborative Inquiry
Liên quan	6	1
Tóm tắt	A longitudinal case study is a qualitative research design that combines the in-depth, contextually rich focus of case study methodology with repeated data collection across multiple time points. Rather than capturing a single snapshot, it follows one or a small number of cases — an individual, group, organisation, or programme — over months or years to trace how processes, relationships, and meanings evolve. This design is well suited to questions about how and why things change, not merely what the state of affairs is at one moment.	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.