Exploring the parameters of “it depends” for estimating the rate of data saturation in qualitative inquiry

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In an earlier blog post on sample sizes for qualitative inquiry, we discussed the concept of data saturation – the point at which no new information or themes are observed in the data – and how researchers and evaluators often use it as a guideline when designing a study.

In the same post, we provided empirical data from several methodological studies as a starting point for sample size recommendations. We simultaneously qualified our recommendations with the important observation that each research and evaluation context is unique, and that the speed at which data saturation is reached depends on a number of factors. In this post, we explore a little further this “it depends” qualification by outlining five research parameters that most commonly affect how quickly/slowly data saturation is achieved in qualitative inquiry.

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?