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	Enkelblind ABAB-design	AB-design
Ämnesområde	Försöksplanering	Försöksplanering
Familj	Process / pipeline	Process / pipeline
Ursprungsår	1960s (ABAB logic); single-blind adaptation formalized in applied behavior analysis from 1970s onward	1960s
Upphovsperson	B. F. Skinner (reversal logic); blinding conventions adapted from clinical trial methodology	Murray Sidman; Baer, Wolf & Risley
Typ	Single-case experimental design with partial blinding	Single-subject experimental design
Ursprungskälla	Kazdin, A. E. (2011). Single-Case Research Designs: Methods for Clinical and Applied Settings (2nd ed.). Oxford University Press. ISBN: 978-0195341881	Sidman, M. (1960). Tactics of Scientific Research: Evaluating Experimental Data in Psychology. Basic Books.
Alias	single-blind reversal design, single-masked ABAB design, blinded single-case reversal design, single-blind withdrawal design	baseline-intervention design, AB single-case design, AB phase design
Närliggande	5	4
Sammanfattning	The single-blind ABAB design is a single-case experimental approach that sequences two baseline phases (A) and two intervention phases (B) to demonstrate experimental control over a target behavior, while keeping one party — typically the outcome assessor or the participant — unaware of current phase assignment. This blinding procedure reduces observer bias or demand characteristics, strengthening the internal validity of the reversal logic.	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.