A designing questionnaire which is worthwhile and easy to interpret and generalizable is an art, and it requires careful planning. The usefulness of questionnaire lies in quantifying the fi ndings of initial exploratory phase. Questions may be open ended (descriptive answer type) or close ended (Y/N type). For a questionnaire to be valid, it should be understood by subjects/participants correctly to answer. Thus, the relevant answer is sought. Questions should be simple and unambiguous. Questions should be devised using all concepts related to aim, and validity and reliability of the questions should be checked by pilot study before conducting the main study.

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