This paper, authored by Edith D. Balbach for California Department of Health Services is designed to allow evaluators to decide weather to use a case study evaluation approach. It also offers guidance on how to conduct a case study evaluation. Contents Using a Case Study as an Evaluation Tool 3 When to Use a Case Study 4 How to Do a Case Study 6 Unit Selection 6 Data Collection 7 Data Analysis and Interpretation 12

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