Following are the essentials of a good questionnaire:
(i) Limited number of questions : The number of questions should be limited as far as possible, normally fifteen to twenty questions are sufficient for making the required enquiry.
(ii) Simplicity : The language of the questions should be simple and easily understandable. It should be clear and not vague. It should not convey two meanings.
(iii) Logically arranged: The questions should be
arranged logically. There should be a proper sequence of the questions.