Σύγκριση μεθόδων

	Σχεδιασμός Solomon Τεσσάρων Ομάδων με Αντιμετάθεση	Σχεδιασμός Τεσσάρων Ομάδων Solomon
Πεδίο	Πειραματικός Σχεδιασμός	Πειραματικός Σχεδιασμός
Οικογένεια	Process / pipeline	Process / pipeline
Έτος προέλευσης	1949 (base design); crossover adaptation developed through later methodological literature	1949
Δημιουργός	Richard L. Solomon (base design); crossover extension via repeated-measures methodology	Richard L. Solomon
Τύπος	Experimental design (pretest-sensitization control + within-subjects crossover)	True experimental design
Θεμελιώδης πηγή	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.
Εναλλακτικές ονομασίες	crossover S4G design, within-subjects Solomon design, repeated-measures Solomon four-group design	Solomon design, four-group design, Solomon four-group control design, S4GD
Συναφείς	5	5
Σύνοψη	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.