The following is a Solomon Four-Group design.Because groups III and IV do not have a before-measure, they cannot be regarded as experimental groups. R 0₁ X 0₂ --------------- R 0₃ 0₄ --------------- R X 0₅ --------------- R 0₆

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In a Solomon Four-Group design, all four groups serve specific purposes, including control and experimental conditions, regardless of whether they have a before-measure. Groups III and IV are still considered part of the experimental design to test for pre-test sensitization effects.

The Following Is a Solomon Four-Group Design