The document discusses the case study method of qualitative research. It defines a case study as an in-depth analysis of an individual, group, or event. The case study method involves two stages: diagnosis, where information is collected to analyze the causes of a problem, and treatment, where the clinician tries to modify behavior and the environment. Key steps in a case study include identifying the problem, collecting and analyzing data from multiple sources, identifying causes, and suggesting and implementing remedial measures. While time-consuming, case studies provide comprehensive understanding of individual behavior in context.