Dear Muhammad,

See the following link as well as the attached file:

https://www.researchgate.net/post/How_is_the_validity_of_a_research_questionnaire_established_in_qualitative_research

Thank you Dr. M. Zahid Latif for raising a very important question.

Validity or relevance should in broad terms ensure face and content validity, both. Likewise, reliability should ascertain more or less consistent responses. None of them can be best checked without a field test and retest / re-validation of the data collection tool. With those in fore, going through the resources suggested by various researchers in response to your question will be of real value.

The following sources should be helpful, particularly: validity and reliability issues/steps in constructing and administering research questionnaires/guidelines for designing questionnaires, etc. as provided by Gall et al (2003).

• Boynton, P. M. and Greenhalgh, T. (2004). Hands-on guide to questionnaire research: Selecting, designing, and developing your questionnaire. British Medical Journal, 328, 7451, pp. 1312-1315.
• Del Greco, L., Walop, W. and McCarthy, R. H. (1987). Questionnaire development: 2. Validity and reliability. Canadian Medical Association Journal, 136, 7, pp. 699-700.
• Gall, M. D., Gall, J. P. and Borg, W. (2003). Collecting Research Data with Questionnaires and Interview. In: Gall, M. D., Gall, J. P. and Borg, W. (eds.) Educational Research: An Introduction. Seventh edition. New York: Pearson Education, Inc., Chapter 8, pp. 221-252.
• How can I assess reliability and validity of a qualitative research questionnaire?: https://www.researchgate.net/post/How_can_I_assess_reliability_and_validity_of_a_qualitative_research_questionnaire

Thanks every one