There is no hard and fast rules regarding the preparation of questionnaire...you can do as per your choice...but try to avoid change as much as possible, but certainly you can change, you can take that from thesis or journals etc.

A good response from Samrat. The answer is yes to each of the four questions. You can also adapt by incorporating aspects of other questionnaire tools as well - as long as all tools are acknowledged.

Samrat Sikdar Dean Whitehead i have asked this question on multiple platforms to get more replies on it but why i am getting different opinions? people said neither i can add nor can omit in adapted questionnaire. what would i do now?

reference: group 'Research Paper, Thesis, Articles and Books'

https://www.facebook.com/groups/1510966875886276/2404276403221981/?comment_id=2404528906530064¬if_id=1573414166785009¬if_t=group_comment

i have been searching since October and found only 3 related research questionnaires (only from credible journal articles) for my one objective only, I couldn’t find any questionnaire for another objective, this is probably the reason my another objective is addressing local area perspective and it is nearly impossible to find and that's why i am asking this question because i am stuck

and the another reason of all this struggle is most of the papers are close in science direct and in emerald insight, and most of the open papers don’t have appendix section from where I can adapt. And apart from these websites if I bring the questionnaire of local journals, it is not accepting.

It is going to depend on what you are hoping to do with the results. Are you hoping to compare the results to other studies using the standard questionnaire? How is the questionnaire scored? How will you use the scores (e.g. are you comparing scores to an outcome, or are you hoping to use cutoffs or norms that have been pre-determined based on the standard questionnaire?).

I would make as minimal changes as needed.

If it is largely for one particular study (rather than comparing to past studies) and you are not using cutoffs/norms from the standard questionnaire, you can modify questionnaires. However you would state that you used a 'modified version of XXX' clearly in all your publications etc,and you would likely want to include a modified version in your publication. You will need to be sure you can carefully justify each change (e.g. why it was critical to your study to change the order of the questions).