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Case studies are in-depth investigations of a single person, group, event, or community, gathering data from various sources and methods like interviews and observations. This technique allows informants to share their experiences, and a large number of concrete cases are collected and analyzed to draw conclusions. Case studies originated in clinical medicine and are widely used in psychology, particularly in abnormal psychology and psychiatry. The procedure involves describing behavior from interviews, observations, and other sources, with the researcher interpreting the information. Sources of data include observations, unstructured interviews, diaries, and official documents. The method involves observing or reconstructing a single participant's or group's history, using an idiographic approach. Interviews are effective for obtaining information, and data can be analyzed using various theories. Strengths of case studies include providing detailed information, insight for further research, and permitting investigation of impractical situations. However, limitations include inability to generalize results, researcher bias, difficulty in replication, and time-consuming nature. Characteristic features of case studies include being a research methodology used in social sciences, investigating a phenomenon in its real-life context, and being a descriptive and exploratory analysis of a person, group, or event.