Researchers need to know what is an appropriate sample size for interview work, but how does one decide upon an acceptable number of people to interview? This question is not relevant to case study work where one would typically interview every member of a case, or in situations where it is both desirable and feasible to interview all target population members. However, in much of qualitative and mixed-methods research and evaluation, the researcher can only reasonably interview a subset of the target population. How big or small should that subset be? This paper provides a brief explanation of why the concept of generalization is inappropriate with respect to the findings from qualitative interviewing, what wording to use in place of generalization, and how one should decide on sample size for interviews.

中文翻译：

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面试时：多少就足够了？

研究人员需要知道采访工作的合适样本量是多少，但是如何确定可接受的采访人数呢？这个问题与案例研究工作无关，在案例研究工作中，一个人通常会采访案例的每个成员，或者在既理想又可行的情况下采访所有目标人群的情况。但是，在许多定性和混合方法的研究和评估中，研究人员只能合理地采访目标人群的一部分。该子集应该是大还是小？本文简要解释了为什么泛化的概念相对于定性访谈的结果是不合适的，用什么措辞代替泛化，以及如何决定访谈的样本量。