how to restrict one respondent only fill in survey only once?

grace2008grace2008 North BrabantCommunity Member Qubie ✭

how to restrict one respondent only fill in survey only once?

hi all, i am designing survey in Qualtrics and I already use the " Prevent Ballot Box Stuffing." However, when I launched the survey in MTurk, i found there are lots of duplicate IP address so respondents clean their cookies and/or use another device. but my research and filter questions need one respondent only fill in survey once. How can I avoid this?

many thanks for your help and solutions.

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