The Solomon four-group design is valuable for controlling threats to validity but is resource intensive. It requires more participants, more time, and more resources than simpler designs, making it less practical for many researchers.
[Reference: Helwig, A. A. (2020). CPCE Study Guide and Review; Royse, D., Thyer, B. A., & Padgett, D. K. (2016). Program Evaluation: An Introduction., ]
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