Creating variables (randomization/whether users have clicked on a link) - by: tpartner

If I wanted to test a change I made to the survey and how that effected that data that was recorded, I believe I would have to activate the survey to get responses, and once I've done that, there is no way to go back and add a new question.

You can only add/remove or change question types when the survey is deactivated because that affects the database columns required to store that data. So, by definition, the data sets for the two survey versions will be different.