I am sing LimeSsurvey version 5.6.43.
I have two public access surveys,  for example Survey A and survey B
Survey B will be inside the link of Survey A. Essentially, people will click on link A and answer questions, then at the end there will be link to survey B 
The person answering survey A will be the same person answering survey B. Due to some ethical considerations we cannot have all the questions in one survey/link.
Later on we would like to merge the datasets uniquely( match and merge responses from survey A and B since the responses will be from the same person)
Is there a way to achieve this?
 

You can use the SAVEDID placeholder in the end URL to load the first survey response ID into the second survey.

- www.limesurvey.org/manual/URL_fields

I once started an article on this on Google Docs.

Share: docs.google.com/document/d/1J4dCuS2Egxv4...ZfQ/edit?usp=sharing

The person answering survey A will be the same person answering survey B. Due to some ethical considerations we cannot have all the questions in one survey/link.
Later on we would like to merge the datasets uniquely( match and merge responses from survey A and B since the responses will be from the same person)

This somehow doesn't make sense to me. If you can't have all the questions in one survey, it is usually because you are not supposed to connect some data with the other. But now at the end you want to connect the data anyway. So why can't you have them all in the same survey? If you connect survey one and survey two via an ID, it is basically the same as if you would have just one big survey.

Maybe your case is different, but the way you describe it at the moment, it gives me the impression that it doesn't make much sense to separate both surveys.

Thank you for this, it worked

Thank you, it was really helpful.

tammo wrote:

I once started an article on this on Google Docs.

Share: docs.google.com/document/d/1J4dCuS2Egxv4...ZfQ/edit?usp=sharing

Why not on www.respondage.nl/blog/ ?