The NCCR on the move have just published a mini-series on overcoming preconceptions. There are three videos of two minutes.
It’s hard to tell whether these are really pre-conceptions, because as far as I know we haven’t asked the general population.
I guess at this general level, there’s nothing controversial in there, but I can already see that to some 5% of 150,000 sounds like a lot of people, or the fact that the majority of immigrants will probably leave in the future can be twisted into denying access services.
If you don’t mind reading a few words, there are many more immigration facts available here: http://indicators.nccr-onthemove.ch/