Hi all,
I'm looking for a way to prevent from participants taking (or trying to take) the survey more than once.
I have an ID which is unique for each participant, and this ID is transferred to the survey using the survey URL and can be saved as an embedded data. Is there any way to accumulate all those embedded data values into a list and then whenever a new user starts the survey, compare the ID to the list and if it's already there redirect the user to the end of survey and give him/her a message that the survey cannot be taken twice?
I was wondering whether the contact list can be used for this purpose (can I "fill" it during the survey run? I read about the triggers but is there something similar for all started surveys - not only completed?)
Thanks in advance
Best answer by bstrahin
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