The biggest difference between case study method and experiment method is that it does not control the background of the phenomenon studied and does not interfere with the changing process of the phenomenon. In addition, the case study method illustrates the problem through one or several selected cases, and analyzes the logical relationship between events with the collected data. Therefore, the conclusions drawn by the case study method do not depend on the sampling principle.
Case study, as an empirical study, obtains knowledge by collecting objective data of things and inducing or explaining them. The result of the research depends largely on the ability of the researchers themselves.
According to the purpose of research, case studies can be divided into descriptive research, interpretive approach, evaluative research and exploratory research. Descriptive case studies mainly describe the general situation of people, events or situations accurately, while teaching cases are mainly descriptive cases.
The purpose of explanatory case study is to summarize the phenomena or findings of the study and finally draw a conclusion. Explanatory case studies are suitable for investigating issues of relevance or causality. In the evaluation case study, the researcher puts forward his own opinions and opinions on the case studied. Exploratory case studies try to find new insights into things or try to evaluate phenomena from a new perspective.