قارن الطرق

	تصميم التجربة القياسي أحادي التعمية قبل وبعد الاختبار	تصميم سليمان الرباعي المجموعات
المجال	التصميم التجريبي	التصميم التجريبي
العائلة	Process / pipeline	Process / pipeline
سنة النشأة	1963 (systematic codification); blinding in use from early 20th century	1949
صاحب الطريقة	Campbell & Stanley (codified); blinding practice has earlier roots in clinical research	Richard L. Solomon
النوع	Controlled experimental design with partial blinding	True experimental design
المصدر التأسيسي	Campbell, D. T., & Stanley, J. C. (1963). Experimental and Quasi-Experimental Designs for Research. Rand McNally.	Solomon, R. L. (1949). An extension of control group design. Psychological Bulletin, 46(2), 137–150.
الأسماء البديلة	single-masked pretest-posttest design, participant-blind pretest-posttest, single-blind before-after design, SB-PP design	Solomon design, four-group design, Solomon four-group control design, S4GD
ذات صلة	6	5
الملخص	The single-blind pretest-posttest experimental design combines two protective strategies: measuring outcomes both before and after treatment to quantify change, and keeping participants unaware of which condition they are in. This pairing controls for preexisting group differences and expectancy-driven response bias, making it a practical middle ground between fully open-label and double-blind trials in behavioral and health research.	The Solomon Four-Group Design extends the classic pretest-posttest control-group design by adding two groups that receive no pretest, enabling researchers to detect whether the pretest itself alters participants' responses to the treatment. Introduced by Richard L. Solomon in 1949, it remains the gold standard for isolating the independent effect of a pretest and for obtaining unbiased estimates of treatment efficacy.