Should we again check the reliability and validity of a pretest questionnaire which was cited by 2000 researchers or use it as is?
The validity should be fine. It is good practice to check the reliability (alpha) of all scales. This will help to determine if you are on the right tract with random sample in your own study.
If the scale has been validated and published in a peer reviewed journal, then you may need to look at your sample. One example would be that individuals should always voluntarily participate in all studies. When I was in undergrad research, I used students who had mandatory requirements to participate in research. This skewed the results of not only my research, but that of prior reliable tests. Apart from inadequate sampling the othe major issue with lw alpha scores would be poor constructs. Hopefully your issue is a sampling problem.
Dear Bilal Sharif,
The response to your question depends on what you want
If you want to check the results in a different context, you should use exactly the same questionnaire.
If you have your own research goal, you should review the questions having your own objectives in mind, and maybe adjust-it for your own purpose.
The validity of a questionnaire is always dependent to the research objectives.
If your research objectives are identical with the ones of the questionnaire, and there is little if any reason to repeat the study, you can use the results already published by others, provided you quote the source.
Best regards,
B
It is good practice to go for final data collection, if reliability value is greater than 0.7.
It is good to improve your survey tool also increase the sample size of your pretesting.
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