เปรียบเทียบวิธี

	การวิเคราะห์วาทกรรมตามช่วงเวลา	การวิเคราะห์วาทกรรมเชิงวิพากษ์
สาขาวิชา	เชิงคุณภาพ	เชิงคุณภาพ
ตระกูล	Process / pipeline	Process / pipeline
ปีกำเนิด	1990s–2000s (systematised as a distinct approach)	Late 1970s–1990s (systematised ~1979–1995)
ผู้ริเริ่ม	Norman Fairclough; Jan Blommaert; applied linguists in sociolinguistics and CDA traditions	Norman Fairclough; Teun A. van Dijk; Ruth Wodak
ประเภท	Qualitative longitudinal research design	Qualitative research method
แหล่งต้นตำรับ	Fairclough, N. (2003). Analysing Discourse: Textual Analysis for Social Research. Routledge. ISBN: 978-0415258937	Fairclough, N. (1992). Discourse and Social Change. Polity Press.
ชื่อเรียกอื่น	LDA, diachronic discourse analysis, longitudinal CDA, discourse change analysis	CDA, Critical Linguistics, Discourse-Historical Approach, Dialectical-Relational Analysis
ที่เกี่ยวข้อง	6	6
สรุป	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.	Critical Discourse Analysis (CDA) is a qualitative method that examines how language in texts and talk constructs, sustains, and challenges relations of power, ideology, and social inequality. Drawing on linguistics, social theory, and critical philosophy, CDA treats discourse not merely as communication but as social practice — a site where dominance is reproduced and where resistance can be articulated. Developed in the late twentieth century by Norman Fairclough, Teun van Dijk, and Ruth Wodak, among others, CDA is applied to political speeches, media texts, policy documents, educational materials, and institutional interactions.