A descriptive technique in which one individual or group is studied in great depth is called a

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A case study involves a detailed examination of an individual or group and is often used to gather qualitative data. Replication involves repeating a study to see if the results can be reproduced, a survey involves gathering data from a sample of individuals through questionnaires or interviews, and naturalistic observation involves observing individuals or groups in their natural environment without intervening.

A Descriptive Technique in Which One Individual or Group Is