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	सिंगल-ब्लाइंड प्रीटेस्ट-पोस्टटेस्ट प्रायोगिक डिज़ाइन	सोलोमन फोर-ग्रुप डिज़ाइन
क्षेत्र	प्रयोगात्मक अभिकल्प	प्रयोगात्मक अभिकल्प
परिवार	Process / pipeline	Process / pipeline
उद्भव वर्ष	1963 (systematic codification); blinding in use from early 20th century	1949
प्रवर्तक	Campbell & Stanley (codified); blinding practice has earlier roots in clinical research	Richard L. Solomon
प्रकार	Controlled experimental design with partial blinding	True experimental design
मौलिक स्रोत	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.
उपनाम	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
संबंधित	6	5
सारांश	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.