What is the method of research that involves extensive,in-depth interviews with a particular individual or small group of individuals?

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Case study research involves extensive, in-depth interviews with a particular individual or small group of individuals. This type of research is typically conducted when the phenomenon being studied is rare or difficult to observe directly, and allows for a detailed examination of individual experiences, behaviors, and attitudes.

What Is the Method of Research That Involves Extensive,in-Depth Interviews