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	AB-design	ABAB-design
Ämnesområde	Försöksplanering	Försöksplanering
Familj	Process / pipeline	Process / pipeline
Ursprungsår	1960s	1960s (Sidman 1960; Baer et al. 1968)
Upphovsperson	Murray Sidman; Baer, Wolf & Risley	Murray Sidman; Baer, Wolf & Risley (applied behavior analysis formalization)
Typ	Single-subject experimental design	Single-subject experimental design
Ursprungskälla	Sidman, M. (1960). Tactics of Scientific Research: Evaluating Experimental Data in Psychology. Basic Books.	Sidman, M. (1960). Tactics of Scientific Research: Evaluating Experimental Data in Psychology. Basic Books.
Alias	baseline-intervention design, AB single-case design, AB phase design	reversal design, withdrawal design, ABAB reversal, operant reversal design
Närliggande	4	4
Sammanfattning	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.	The ABAB design is a single-subject experimental methodology that establishes causal control by repeatedly introducing and removing an intervention. A baseline phase (A) is followed by an intervention phase (B), then a return to baseline (A), and a second intervention phase (B), allowing the researcher to demonstrate that observed behavior changes are produced by the intervention rather than by coincidental factors.