案例研究法是实地研究的一种。研究者选择一个或几个场景为对象，系统地收集

Case study method is a kind of field research. The researcher selects one or several scenes as the object, systematically collects data and information, and conducts in-depth research to explore the situation of a certain phenomenon in the actual living environment. Suitable when the boundary between the phenomenon and the actual environment is unclear and difficult to distinguish, or the researcher is unable to design accurate, direct and systematically controlled variables, answering "how to change", "why it becomes like this", and "what is the result", etc. research problem. <br><br>It also includes unique design logic, specific data collection and unique data analysis methods. Field observation can be used, or information can be obtained through research documents. The research is more biased and qualitative, and has characteristics in data collection and data analysis, including reliance on multiple sources of evidence. Different data evidence must be able to converge under the triangulation test and get the same conclusion; usually there are pre-developed theoretical propositions or problem definitions , To guide the direction of data collection and the focus of data analysis, to focus on the inspection of events at the time, without intervention in the manipulation of events, to preserve the integrity of life events and discover meaningful features. Compared with other research methods, it can provide a solid description and systematic understanding of the case, grasp the dynamic interaction process and the context of the situation, and obtain a more comprehensive and holistic view.

Only eat more on holidays than on holidays ...

Case study method is a kind of field research. Researchers choose one or several scenes as objects, systematically collect data and materials, and conduct in-depth research to explore the situation of a phenomenon in the real life environment. It is suitable for answering research questions such as "how to change", "why to become this way" and "what is the result" when the boundary between phenomenon and actual environment is not clear and difficult to distinguish, or researchers can not design accurate, direct and systematic variables.<br>At the same time, it includes special design logic, specific data collection and unique data analysis method. Field observation can be used, or data can be obtained through research documents. The research is more qualitative and has characteristics in data collection and data analysis, including relying on multiple sources of evidence. Different data and evidence must be able to converge in the form of trigonometric test and reach the same conclusion; Generally, there are pre developed theoretical propositions or problem definitions to guide the direction of data collection and the focus of data analysis. Focusing on the inspection of the events at that time, without intervention in the control of events, the integrity of life events can be preserved and meaningful features can be found. Compared with other research methods, we can get a more comprehensive and holistic view if we can make a solid description and systematic understanding of the case, and grasp the dynamic interaction process and context.<br>