A case is a typical statement of events with multiple meanings that people experience in their production and life

Case, there are individual case, instance, case and so on several formulation. At first, the word "case" was used to refer to medical cases and individual cases. Specific tell, it is to the record of illness diagnosis, treatment method, in order to have a reference. According to the case, we can conduct in-depth research and analysis on relevant issues, excavate and find out the elements with regularity and universality, which is one of the most rapid and accurate research means and methods in applied disciplines. In psychology, management, education, medicine, law and other disciplines, case analysis has long become the most effective research tool. As a very wide application of public relations, its case study also occupies an important position in the whole system.
Generally speaking, cases are said differently in different fields and different people's understanding. Some argue that a case is a typical event that actually occurs, including a problem or difficult situation. Others consider the case to be an example of an event of interest to the researcher. To combine these two views, a case is a person's capture of a typical event that has occurred. It's like a story, but it's not just a story.