手法を比較

	Longitudinal Discourse Analysis	Thematic Analysis
分野	質的手法	質的研究
系統	Process / pipeline	Process / pipeline
提唱年	1990s–2000s (systematised as a distinct approach)	2006
提唱者	Norman Fairclough; Jan Blommaert; applied linguists in sociolinguistics and CDA traditions	Virginia Braun and Victoria Clarke
種類	Qualitative longitudinal research design	Method
原典	Fairclough, N. (2003). Analysing Discourse: Textual Analysis for Social Research. Routledge. ISBN: 978-0415258937	Braun, V., & Clarke, V. (2006). Using thematic analysis in psychology. Qualitative Research in Psychology, 3(2), 77–101.
別名	LDA, diachronic discourse analysis, longitudinal CDA, discourse change analysis	TA, Reflexive Thematic Analysis
関連	6	3
概要	Longitudinal Discourse Analysis (LDA) is a qualitative research approach that examines how discourse — language in use, texts, talk, and representational practices — changes across time. Rather than analysing a single snapshot of language, LDA collects and compares discourse data at multiple points to uncover how meanings, identities, ideologies, or social practices evolve, stabilise, or shift under the influence of historical, institutional, or societal forces.	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.