手法を比較

	Longitudinal Content Analysis	Thematic Analysis
分野	質的手法	質的研究
系統	Process / pipeline	Process / pipeline
提唱年	Mid-20th century onward; systematized alongside content analysis (Berelson, 1952; Krippendorff, 1980)	2006
提唱者	Developed within the content analysis tradition; longitudinal extensions widely applied since the mid-20th century in communication and political science research	Virginia Braun and Victoria Clarke
種類	Qualitative and mixed-methods research design	Method
原典	Krippendorff, K. (2018). Content Analysis: An Introduction to Its Methodology (4th ed.). Sage. ISBN: 978-1506395661	Braun, V., & Clarke, V. (2006). Using thematic analysis in psychology. Qualitative Research in Psychology, 3(2), 77–101.
別名	LCA, repeated content analysis, diachronic content analysis, trend content analysis	TA, Reflexive Thematic Analysis
関連	5	3
概要	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.	Thematic Analysis (TA) is a qualitative research methodology for identifying, analyzing, and reporting patterns (themes) in qualitative data. Developed systematically by Virginia Braun and Victoria Clarke (2006), TA is flexible and accessible, applicable across diverse theoretical frameworks and data types, making it one of the most widely used qualitative methods in psychology, health research, and social sciences.