قارن الطرق

	تصميم AB المحظور	تصميم الخطوط الأساسية المتعددة
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	Donald M. Baer, Montrose M. Wolf, Todd R. 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	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	MBD, multiple-baseline single-case design, staggered baseline design, multiple-probe 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 multiple baseline design is a single-subject experimental design that demonstrates functional control by introducing an intervention at staggered time points across two or more baselines — typically across different behaviors, individuals, or settings. Because no withdrawal of treatment is required, it is especially suitable when the target behavior is irreversible or when removing an effective intervention would be unethical.