השוואת שיטות

	מערך סולומון ארבע-הקבוצות הכפול-סמיות	תכנון ניסויי עם קבוצת ביקורת
תחום	תכנון ניסויים	תכנון ניסויים
משפחה	Process / pipeline	Process / pipeline
שנת המקור	1949 (Solomon design); double-blind blinding integrated in 20th-century experimental practice	1935 (Fisher); 1963 (Campbell & Stanley codification)
הוגה השיטה	Richard L. Solomon (base design); double-blind protocol is a general methodological standard	Ronald A. Fisher; systematised by Donald T. Campbell & Julian C. Stanley
סוג	True experimental design	Experimental research design
מקור מכונן	Solomon, R. L. (1949). An extension of control group design. Psychological Bulletin, 46(2), 137–150.	Campbell, D. T., & Stanley, J. C. (1963). Experimental and Quasi-Experimental Designs for Research. Rand McNally.
כינויים	double-blind S4GD, blinded Solomon design, double-blind four-group design, Solomon four-group with double-blind	controlled experiment, true experimental design, randomized controlled design, treatment-control design
קשורות	5	4
תקציר	The double-blind Solomon four-group design combines Richard Solomon's classic four-group structure — which isolates pretest sensitization effects — with double-blind blinding, ensuring that neither participants nor outcome assessors know group assignments. This combination yields high internal validity by controlling simultaneously for testing effects, expectancy bias, and experimenter influence, making it one of the most rigorous true experimental designs available.	Control group experimental design is a fundamental experimental structure in which participants are assigned to at least two groups — a treatment group that receives the intervention and a control group that does not — so that the effect of the intervention can be isolated by comparing outcomes across groups. Randomisation of assignment strengthens causal inference by balancing known and unknown confounders.