The Solomon four-group design Solomon,1949)is viewed by some as the purest of research designs.

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The Solomon Four-Group Design is considered by some researchers as the purest form of experimental design because it allows for the assessment of both the pretest and posttest effects, as well as the treatment effect, by comparing four different groups: one that receives a pretest and the treatment, one that receives only the treatment, one that receives a pretest and no treatment, and one that receives neither. This comprehensive approach helps in controlling for both the testing effect and the interaction effects between testing and the treatment, providing a clearer understanding of the treatment's actual impact.

The Solomon Four-Group Design Solomon,1949)is Viewed by Some as the Purest