How is it possible to allow participants to take part in four or more surveys over time, but to relate the data to each other?
The first survey should be open and the subjects also give their mail address. After one, two and three months, the subjects should then each receive a reminder mail by sending a link to fill in a questionnaire again. The data should then all be related to each other.
You can use tokens to send invitations for the subsequent surveys but there is no automatic method to create those. You will need to use a remote PHP script (or possibly CRON job) that uses the API or directly accesses the database.
Cheers,
Tony Partner Solutions, code and workarounds presented in these forums are given without any warranty, implied or otherwise.
