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	एबी डिज़ाइन	एकल-विषय प्रायोगिक डिज़ाइन
क्षेत्र	प्रयोगात्मक अभिकल्प	प्रयोगात्मक अभिकल्प
परिवार	Process / pipeline	Process / pipeline
उद्भव वर्ष	1960s	1960s (Sidman 1960; formal applied codification by Kazdin and Baer in 1970s–1980s)
प्रवर्तक	Murray Sidman; Baer, Wolf & Risley	Murray Sidman (foundational tactics); B. F. Skinner (applied behavior analysis lineage)
प्रकार	Single-subject experimental design	Experimental research design
मौलिक स्रोत	Sidman, M. (1960). Tactics of Scientific Research: Evaluating Experimental Data in Psychology. Basic Books.	Kazdin, A. E. (1982). Single-Case Research Designs: Methods for Clinical and Applied Settings. Oxford University Press. ISBN: 978-0195030440
उपनाम	baseline-intervention design, AB single-case design, AB phase design	SSED, single-case experimental design, n-of-1 design, intrasubject replication design
संबंधित	4	6
सारांश	The AB design is the simplest single-subject experimental design, consisting of two sequential phases: a baseline phase (A) in which the target behavior is observed under natural conditions without intervention, followed by an intervention phase (B) in which the treatment or manipulation is introduced. Changes in the behavior's level, trend, or variability between phases are used to infer the effect of the intervention on the individual participant.	Single-subject experimental design (SSED) establishes experimental control by repeatedly measuring one individual (or a small number of individuals) across baseline and intervention phases, using the participant as their own control. Instead of comparing groups, it compares the participant's own behavior across conditions over time. Widely used in applied behavior analysis, special education, rehabilitation, and clinical psychology, SSED allows causal inference from small or unique samples where group designs are impractical.