Advantages or merits of a questionnaire
- They usually have standardized answers that make it simple to compile data.
- They do not require as much effort from the questioner as verbal or telephone surveys.
- Very economical in terms of time, energy and money. Widely used when the scope of inquiry is large.
- Data collected by this method is not affected by the personal bias of the researcher.
Disadvantages or demerits of a questionnaire
- They are sharply limited by the fact that the respondents must be able to read the questions and respond to them.
- Questioner may have a problem in question construction and wording those respondents may give varying answers.
- The respondents may not be cooperative and honest hence affecting the accuracy of the information.