The purpose of this investigation was to empirically evaluate a sexual assault prevention program. Of the 360 female college students who participated in the investigation, 181 students were in the treatment group and 165 students were in the control group. Although the program was not effective in decreasing the incidence of sexual assault for women with a sexual assault history, it was effective in decreasing the incidence of sexual assault for women without a sexual assault history. The program also led to a decrease in dating behaviors found to be associated with acquaintance rape and an increase in knowledge about sexual assault for the treatment group. The implications of these results for future preventive efforts are discussed.