Is it possible for people who have filled in a partial survey to go back and complete it?
It is possible, and there are a couple of ways this can be done (dependent on how the survey was originally distributed).
If you sent your survey via a SurveyGizmo Email Campaign, respondents simply need to access their original links to finish their surveys.
If you sent out your survey via a general/default link, this is a little trickier. You would need some way to identify your current responses, and could then send the respondents their edit links:
An edit link will allow resopndents to re-access their responses and finish the.
I hope this helps!
Very helpful; thank you, Lola!