In-depth research in which the sample consists of just one person, or a small group, is called a(n):

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A case study is a research method involving an up-close, in-depth, and detailed examination of a subject of study (the case), as well as its related contextual conditions. It often involves a small group or an individual, allowing researchers to gain a deep understanding of the participants and their behaviors.

In-Depth Research in Which the Sample Consists of Just One