Investigators use pre-designed standardized questionnaires to collect information and conduct research and analysis on respondents. The advantages of questionnaire survey method are high efficiency, large sample survey can be conducted in a short time, and a large number of rich and detailed data can be collected, which is easy for quantitative analysis, and the personal factors of investigators have little influence on the survey quality.
Its shortcomings are high cost, long research time, obviously insufficient research depth, and low research validity and reliability to explain the reasons for the phenomenon.