Linking participants repsonses in two time frame data collections

Has anyone idea how do you allow participants to generate individual codes so they can access the survey at time 1 ( pre intervention) and then at time 2 (post intervention) ? Is there a way to link the participants’ responses from time 1 and 2? while keeping it all anonymous?

I have a method for creating a participant ID based on email addresses, which isn’t back translatable. It does, of course, rely on the participant remembering which email address they used.

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Not sure if this is helpful, but you could ask a question at the beginning of Survey Time 1 and then Survey Time 2, that the participant would know the answer to without having to remember a code. These could be matched later. Something as unique as possible: for example…

Hi Colin,

That’s a very good suggestion!

Thanks so much