Anonymous and individual links and follow up surveys

If you collect email and whatever other information you need about the respondent in the first survey, you can use a Survey Response/XM Directory Action to add the respondent to a contact list. You can then send invites and reminders to the contact list.
If you want to automate the entire process you can use a Survey Response/Web Service Action to call a script that uses the API to do everything (add to contact list, schedule invite in 10 week, schedule reminder, etc.)

Thanks for your reply TomG I have tried to set up an XM Directory Action (as per the guidance for linking longitudinal studies) but it just doesn't work? After entering the information it doesn't allow me to save, making me think I am missing something that is required, but I can't work out what.
'Survey Response/Web Service Action to call a script that uses the API to do everything' - I think this might be a bit beyond my limited knowledge, is it something I can request support for from the Support Team?

https://www.qualtrics.com/community/discussion/comment/31187#Comment_31187Support can help you figure out what you are missing in the XM Directory Action. They will not help you with an API automation script.

Beth_R123 were you able to figure this out? Im doing almost the same design.