The logical positivism approach favors the experimental manipulation and control of variables in order to identify those variables that differentiate acknowledged from unacknowledged victims. However, in the study of rape it is not possible to experimentally manipulate variables. Consequently, research in this area typically involves surveying women about their attitudes, personalities, past experiences, and the events that occurred before, during, and after their assault. The investigator then compares acknowledged and unacknowledged victims on these variables to determine whether the two groups of victims differ on any of them.