The investigator uses a pre-designed standardized questionnaire to collect information and conduct research and analysis on the subject. Questionnaire survey method has the advantage of high efficiency, can be conducted in a short period of time, a large sample survey, to collect a large number of content-rich, detailed information, easy to quantify and analyze, and the investigator's personal factors on the quality of the survey has less impact.
It has the disadvantage of higher cost, longer research time, and in-depth research is obviously insufficient in explaining the causes of the phenomenon of research validity and reliability are not high.