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	Solomon Four-Group Design	Randomiserad kontrollerad studie (RCT)
Ämnesområde	Försöksplanering	Försöksplanering
Familj	Process / pipeline	Hypothesis test
Ursprungsår	1949	1948
Upphovsperson	Richard L. Solomon	James Lind (early precursor, 1747); modern formulation: Austin Bradford Hill & Medical Research Council (1948)
Typ	True experimental design	Interventional comparative study
Ursprungskälla	Solomon, R. L. (1949). An extension of control group design. Psychological Bulletin, 46(2), 137–150.	Schulz, K.F., Altman, D.G., Moher, D., for the CONSORT Group (2010). CONSORT 2010 Statement: Updated Guidelines for Reporting Parallel Group Randomised Trials. BMJ, 340, c332.
Alias	Solomon design, four-group design, Solomon four-group control design, S4GD	RCT, randomised controlled trial, clinical trial, Randomize Kontrollü Çalışma (RCT) Tasarımı
Närliggande	5	7
Sammanfattning	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.	A randomized controlled trial (RCT) is the gold standard experimental design in clinical and health research, in which participants are randomly allocated to a treatment group or a control group so that the effect of an intervention can be measured with the highest possible degree of internal validity. The modern parallel-group RCT was formalized by Austin Bradford Hill and the Medical Research Council in their landmark streptomycin trial of 1948, and its reporting is governed today by the CONSORT 2010 guidelines (Schulz et al., 2010).