Success of this method greatly depends upon the way in which the questionnaire is drafted. So the investigator must be very careful while framing the questions. The questions should be

(i) Short type and clear questions must be given.

(ii) The size of the question should be kept minimum.

(iii) Attention must be given on the wording of the questions. Simple words familiar to all should be given.

(v) Impersonal and non-aggressive type questions should be set.

(vi)The questions should be simple alternative, multiple-choice or open-end type. In the   simple alternative question type, the respondent has to choose between alternatives such as ‘Yes or No’, ‘right or wrong’ etc.

(vii) Appropriate rating scale should be used as the data collection tool.

(viii)The questions should proceed in sequential manner moving from easy to difficult questions.

(ix) The questions of personal nature should be avoided as far as possible.

(xi) There should be some control questions so as to test the reliability of the responses.

(xii) Brief directions of filling up the questionnaire should invariably be given.

(xiii) Adequate space for answers should be provided in the questionnaire to help editing and tabulation of the collected data.

(xiv) Finally the physical appearance of the questionnaire should be very attractive particularly in mail surveys.

The questionnaire method is very economical in terms of time, energy and money. The method is widely used when the scope of enquiry is large. Data collected by this method are not affected by the personal bias of the investigator. However the accuracy of the information depends on the cooperation and honesty of the informants. This method can be used only if the informants are cooperative, conscious and educated. This limits the scope of the method.

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