When doing in-depth interviews, a researcher should not ask respondents to recommend other knowledgeable sources because such an unrepresentative sample may bias the results of the research.

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Asking respondents to recommend other knowledgeable sources is a technique known as snowball sampling, which can be particularly useful in qualitative research for reaching hard-to-find populations or gaining in-depth insights from a specific community of interest.

When Doing In-Depth Interviews, a Researcher Should Not Ask Respondents