I'm running a survey (well, technically a psychology experiment) where users will frequently return to past questions during the survey and will be given the option to provide new answers.
In one project I've set up a series of page triggers to allow for participants to move around to pages they want, but when they return to past pages the previous answer they gave (in a multiple choice question) is already filled in.
My question is: How can you keep participants' past answers from showing up when they return to pages with questions that they've answered in the past?
I've tried fixing this by recoding their past answers to be 999 when they return to an old question, but this doesn't fix the problem.
If someone wants to preview the test survey, check out http://ww3.unipark.de/uc/CDS/e0f1/