How can I get questionnaires of previous studies?

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Any tips on how to increase the chances of getting a response?

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Wolfgang R. Dick

Perhaps my reply to this question may give you some help: https://www.researchgate.net/post/How_to_research_papers_that_include_questionnaire

Galvin Kuan Sian Lee

ChatGPT can help on this. Just prompt it to find recent empirical studies that come with questionnaires/surveys/measurement of constructs. Although not the best option (because of it's limited search reach), but quickest, for your purpose.