Questionnaires provide quantitative and qualitative methods of data gathering - the evidence, data or information you find can be expressed in numerical or descriptive terms.
An alternative to a self-completion questionnaire is a structured interview, where the questionnaire is administered in person or over the telephone. The advantage of using a questionnaire rather than an interview is that you can reach large numbers of people more easily, as you can leave them to fill in the questionnaire and send it back to you.
Questionnaires are more rigid than interviews. Unless you leave a space for the interviewee to write their own answer (e.g. 'If you have any more comments please write in the space provided'), the respondent can only choose from the range of answers you have given. You therefore have to make sure that you have designed your questionnaire well.
A questionnaire is an instrument for collecting data, and almost always involve asking a given subject to respond to a set of oral or written questions.
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