1. The function of the questionnaire is to systematically collect and accumulate relevant data and information in a unified way, and provide a basis for the process.
2. The main step of applying the questionnaire is to clarify the purpose of the survey.
3. Determine the variables and data types to be collected.
4. Determine other information needed for analysis.
5. Design the questionnaire. Pre-test the questionnaire. Periodically review and revise the questionnaire.