قارن الطرق

	تصميم AB المحظور	تصميم AB
المجال	التصميم التجريبي	التصميم التجريبي
العائلة	Process / pipeline	Process / pipeline
سنة النشأة	1970s–1980s (systematic development of blocked randomization in single-case research)	1960s
صاحب الطريقة	Based on Fisher's randomized block principle (1926) applied to single-case AB designs	Murray Sidman; Baer, Wolf & Risley
النوع	Single-subject experimental design with blocking	Single-subject experimental design
المصدر التأسيسي	Edgington, E., & Onghena, P. (2007). Randomization Tests (4th ed.). Chapman and Hall/CRC. ISBN: 978-1584885894	Sidman, M. (1960). Tactics of Scientific Research: Evaluating Experimental Data in Psychology. Basic Books.
الأسماء البديلة	blocked AB single-case design, randomized block AB design, AB design with blocking, blocked baseline-treatment design	baseline-intervention design, AB single-case design, AB phase design
ذات صلة	6	4
الملخص	The Blocked AB Design applies the logic of randomized block experimental design to the classic single-subject AB framework. Observation sessions are organized into blocks — matched sets of time points or contextual units — and the assignment of baseline (A) and treatment (B) phases is randomized within each block. This controls for nuisance time-based variability while preserving the interpretive simplicity of the fundamental two-phase single-case structure.	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.