What are the methods to collect data?

Interview survey: an investigation method in which investigators and respondents get the information they need through face-to-face conversation.

Mail survey: a survey method in which questionnaires or questionnaires are sent to the respondents by mail or propaganda media, filled out by the respondents, and then mailed or delivered to designated collection points.

Telephone survey: Telephone survey is a survey method in which investigators communicate with respondents by telephone to obtain information.

Computer-aided survey: This kind of survey makes telephone survey more convenient and faster, and also greatly improves the quality of the survey.

Symposium: a method of gathering a group of respondents at the survey site to express their opinions on the theme of the survey, so as to obtain survey data.

Personal in-depth interview: a special qualitative research in which only one interviewee participates at a time.

Observation: refers to the method that investigators record and collect information while observing the actions and consciousness of the respondents.

Experimental method: an investigation method of conducting experiments on subjects in a specific experimental place and state to obtain the required information.

Among them, the first six methods belong to inquiry and investigation, while the last two methods belong to observation and experiment.