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Solomon Three- and Four-Group Designs
| Design | Randomization | Group Assignment | Baseline/Pre-test | Intervention | Post-test |
|---|---|---|---|---|---|
| 3-Group | R | Group 1 | O1 | X | O2 |
| R | Group 2 | O1 | O2 | ||
| R | Group 3 | X | O2 | ||
| 4-Group | R | Group 1 | O1 | X | O2 |
| R | Group 2 | O1 | O2 | ||
| R | Group 3 | X | O2 | ||
| R | Group 4 | O2 |
Note. R = Random assignment; O = Observation; X = Intervention.
