prevention of duplicate enrollment

Question

Is it possible for SoSci Survey to prevent or exclude duplicate registrations, for example when the same name and date of birth are entered?
Since participants will be randomly assigned to either the control group or the intervention group, there may be an incentive for some participants to register more than once.
thank you very much in advance

Answer 1

It's not that simple ... here's an explanation and possible options:
Prevent Multiple Submissions by the Same Respondent