So sánh phương pháp

	Phân tích tài liệu theo chiều dọc	Phân tích nội dung theo chiều dọc
Lĩnh vực	Định tính	Định tính
Họ	Process / pipeline	Process / pipeline
Năm ra đời	2003–2009 (formalized in qualitative research methodology)	Mid-20th century onward; systematized alongside content analysis (Berelson, 1952; Krippendorff, 1980)
Người khởi xướng	Glenn A. Bowen (document analysis framework); Johnny Saldaña (longitudinal qualitative methods)	Developed within the content analysis tradition; longitudinal extensions widely applied since the mid-20th century in communication and political science research
Loại	Qualitative longitudinal research design	Qualitative and mixed-methods research design
Công trình gốc	Bowen, G. A. (2009). Document analysis as a qualitative research method. Qualitative Research Journal, 9(2), 27–40.	Krippendorff, K. (2018). Content Analysis: An Introduction to Its Methodology (4th ed.). Sage. ISBN: 978-1506395661
Tên gọi khác	longitudinal documentary research, longitudinal archival analysis, repeated document analysis, LDA	LCA, repeated content analysis, diachronic content analysis, trend content analysis
Liên quan	3	5
Tóm tắt	Longitudinal document analysis is a qualitative research approach that systematically collects and analyzes documents at multiple time points to trace how phenomena, discourses, policies, or organizational practices change over time. By treating documents as primary data sources rather than supplementary evidence, researchers can reconstruct temporal trajectories, identify turning points, and understand how meaning evolves across extended periods without requiring direct participant contact.	Longitudinal Content Analysis (LCA) applies systematic content analysis to documents, media, or texts sampled at two or more time points in order to detect how themes, frames, language, or discourse patterns change or persist over time. Drawing on the established logic of content analysis, it adds a temporal dimension that allows researchers to chart trends, trace the evolution of representations, and test hypotheses about historical or social change. It is widely used in communication research, political science, media studies, and the health sciences.