The system I am most familiar with is American Combato, founded by Professor Bradley J. Steiner. Professor Steiner did not allow any contact at all in class due to concern with preventing injury or death. Professor Steiner did not believe that stopping short of making contact would bring about a psychological barrier that would prevent you from making contact if you were using the form on an attacker on the streets based on his own experiences being attacked and successfully defending himself in the Bronx, as well as the experiences of other students. Do you find this to be the case? Can you successfully learn to defend yourself without making contact in class, or is full contact necessary or at least preferable to non contact when it comes to preparing yourself to defend yourself against an attacker on the streets?