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	Solomon fyrgruppsdesign med crossover	Solomon Four-Group Design
Ämnesområde	Försöksplanering	Försöksplanering
Familj	Process / pipeline	Process / pipeline
Ursprungsår	1949 (base design); crossover adaptation developed through later methodological literature	1949
Upphovsperson	Richard L. Solomon (base design); crossover extension via repeated-measures methodology	Richard L. Solomon
Typ	Experimental design (pretest-sensitization control + within-subjects crossover)	True experimental design
Ursprungskälla	Solomon, R. L. (1949). An extension of control group design. Psychological Bulletin, 46(2), 137–150.	Solomon, R. L. (1949). An extension of control group design. Psychological Bulletin, 46(2), 137–150.
Alias	crossover S4G design, within-subjects Solomon design, repeated-measures Solomon four-group design	Solomon design, four-group design, Solomon four-group control design, S4GD
Närliggande	5	5
Sammanfattning	The Crossover Solomon Four-Group Design merges two powerful experimental strategies: the Solomon four-group design's control for pretest sensitization and the crossover design's within-subjects efficiency. Participants are randomly assigned to one of four groups that vary in whether they receive a pretest and in the sequence of treatment and control conditions, allowing the researcher to simultaneously estimate treatment effects, pretest effects, and their interaction while controlling for individual differences through repeated measurement.	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.