Questionnaires are written inquiries that can be used for fact collection of various kinds, like opinion polls, evaluations and knowledge tests, where the answers are not known.
The questionnaire could be a postal questionnaire, group questionnaire or a reply stub. Which method you choose depends on what the aim of the enquiry is and the resources available. An advantage of the questionnaire compared to the interview is that it can reach many simultaneously – conducting interviews with the same number of people would require significantly more time. In a questionnaire the respondents could be anonymous, which renders follow-ups impossible if an answer need elaboration or explanation. The interview has an obvious advantage there.
The questionnaire could be a postal questionnaire, group questionnaire or a reply stub. Which method you choose depends on what the aim of the enquiry is and the resources available. An advantage of the questionnaire compared to the interview is that it can reach many simultaneously – conducting interviews with the same number of people would require significantly more time. In a questionnaire the respondents could be anonymous, which renders follow-ups impossible if an answer need elaboration or explanation. The interview has an obvious advantage there.
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