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	Projekt czterogrupowy Solomona	Projekt eksperymentalny typu pretest-posttest
Dziedzina	Planowanie eksperymentów	Planowanie eksperymentów
Rodzina	Process / pipeline	Process / pipeline
Rok powstania	1949	1963 (formalized in Campbell & Stanley)
Twórca	Richard L. Solomon	Donald T. Campbell and Julian C. Stanley
Typ	True experimental design	Experimental / quasi-experimental research design
Źródło pierwotne	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.
Inne nazwy	Solomon design, four-group design, Solomon four-group control design, S4GD	pretest-posttest design, before-after design, pre-post design, two-wave experimental design
Pokrewne	5	5
Podsumowanie	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.	The pretest-posttest experimental design measures participants on the outcome variable before and after treatment, typically with random assignment to treatment and control groups. The difference between pre- and post-scores isolates the treatment effect from baseline variation, making this one of the most widely used frameworks in experimental and quasi-experimental research across education, psychology, medicine, and the social sciences.