1. What is Solomon Four-Group Design and where is it mostly used?
2. What are the assumptions of Solomon Four-Group Design?
3. What are the strengths and weaknesses of Solomon Four-Group Design?
4. What are the threats to internal and external validity of Solomon Four-Group Design?
5. Analyze Solomon Four-Group Design in terms of appropriateness, assumptions, strengths and weaknesses, and threats to internal and external validity
6. Provide references less than 5 years old