What are the four investigation methods?

The survey methods include general film survey, key survey, typical survey and sampling survey.

1, general film survey:? Census is also called comprehensive census and comprehensive census, which is called census. The so-called general investigation is to investigate every part and every molecule in the whole investigation, and we can't miss it.

2. Key survey:? Focus investigation, also known as "case study", refers to the method of detailed investigation and research on a group, an organization or a person and an event. Case study is an in-depth investigation.

3. Typical survey:? A typical survey is an incomplete survey based on the purpose and requirements of the survey, and on the basis of a preliminary analysis of the respondents, a few representative typical units are consciously selected for in-depth and detailed investigation and study to understand the development and change law and essence of similar things. A typical investigation needs to collect a lot of first-hand information, make clear all aspects of the typical investigation, conduct systematic and detailed anatomy, and draw conclusions and methods to guide the work.

4. Sampling survey:? Sampling survey: it is a non-comprehensive survey, which is a survey method that selects some units from all the survey research objects and estimates and infers all the survey research objects accordingly. Advantages: Less manpower, material resources and financial resources are consumed, which greatly saves the investigation time.

Main characteristics of investigation methods

1. Investigation is one of the commonly used methods in scientific inquiry. When investigating, it is necessary to make clear the purpose and object of the investigation, make a reasonable investigation plan, truthfully record and sort out the analysis results, and sometimes make statistics by mathematical methods. The commonly used survey methods are general survey and sampling.

2. The method of asking the respondent to state the question in the form of a question. According to the needs of research, we can investigate the respondents themselves or those who are familiar with the respondents. Survey methods can be divided into written survey and oral survey.

3. The survey method can collect a large amount of data at the same time, which is convenient to use and efficient.