قارن الطرق

	تصميم AB المحظور	تصميم ABA
المجال	التصميم التجريبي	التصميم التجريبي
العائلة	Process / pipeline	Process / pipeline
سنة النشأة	1970s–1980s (systematic development of blocked randomization in single-case research)	1968
صاحب الطريقة	Based on Fisher's randomized block principle (1926) applied to single-case AB designs	Montrose Wolf, Donald Baer, Todd Risley (applied behavior analysis tradition)
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	Baer, D. M., Wolf, M. M., & Risley, T. R. (1968). Some current dimensions of applied behavior analysis. Journal of Applied Behavior Analysis, 1(1), 91–97.
الأسماء البديلة	blocked AB single-case design, randomized block AB design, AB design with blocking, blocked baseline-treatment design	reversal design, withdrawal design, ABA withdrawal 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 ABA design is a single-subject experimental design that demonstrates experimental control through three sequential phases: a baseline phase (A1), an intervention phase (B), and a return-to-baseline withdrawal phase (A2). By removing the intervention in the final phase and observing whether behavior reverts toward baseline levels, researchers establish a functional relationship between the treatment and the target behavior for an individual participant.