I have three surveys that must be completed in order, with spacing of several weeks in between. I am surveying students, and want to ensure they can only complete each survey once. Prevent ballotbox stuffing won't work as they can use different computers to get around this. I think the easiest solution would be to ask for their student ID number at the start of the survey, and then do a validation check which involves checking if this number has already been entered in the recorded data, if it has, then they cannot proceed. Is it possible to validate a response based on identical matches already submitted for that variable? I can't seem to find a way to do this. Any help would be much appreciated
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