Riddle me this: How many interviews (or focus groups) are enough?

 
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The first two posts in this series describe commonly used research sampling strategies and provide some guidance on how to choose from this range of sampling methods. Here we delve further into the sampling world and address sample sizes for qualitative research and evaluation projects. Specifically, we address the often-asked question: How many in-depth interviews/focus groups do I need to conduct for my study?