define what a  case study is
case study-a detailed analysis of a person or group from a social or psychological or medical point of view. analysis-an investigation of the component parts of a whole and their relations in making up the whole.
In doing case study research, the case being studied may be an individual, organization, event, or action, existing in a specific time and place. For instance, clinical science has produced both well-known case studies of individuals and also case studies of clinical practices.