prevent crime, to understand why crime happens, we need to understand the other party in the exchange as well. the victim. not to say at all that the victim is causing the crime to happen, but just to understand who they're most likely to be and what we can do to intervene to prevent a crime from happening. so the way that that's being -- >> the way that's being applied -- go ahead, john. >> go ahead. >> the way that's being applied in chicago is that the head of schools there, ron huberman, head of the chicago public schools, he studied the several hundred students who were shot over the last few years. it's more than 1,000, actually. to create kind of a profile, like a prediction model, a statistical prediction model that would allow him to identify those students who are in school now, who are most likely to be shot. and then he is directing his program towards them.