I work at a Zoo and early last year, I did a survey with visitors regarding their perceptions and knowledge about some specific animals. Over the course of the past year, we've done a series of events and exhibits about these animals and now I am wanting to test for any change in visitor knowledge/perceptions. I'm trying to decide if I go back to exact same sample (I have most of their emails) and ask the same questions, or should I conduct the survey with a different set of visitors? Or should I do both? Any thoughts as to the most appropriate design?
Thanks so much.