Slonim-Nevo, Auslander, Ozawa & Jung (1996) examined the effects of an AIDS-preventative intervention among delinquent and abused adolescents (St. Louis evaluation). 218 adolescents from 15 residential centers participated in an experimental study in which they were assigned to one of three groups: skills training, discussion-only, or the control group. There were several similarities to the two experimental groups: each consisted of nine 90- to 120-minute sessions conducted over the course of 3 weeks, both were led by trained facilitators, and the substantive content was identical (Slomin-Nevo et al., 1996). The manner in which each intervention was conducted differed. Whereas participation in the discussion-only group was didactic, participation in the group skills intervention was hands-on, including role-playing, modeling and demonstrations. Follow-up results show no significant impacts on risky sexual behavior (unprotected sex or sex with an unknown partner) among any of the participants regardless of which intervention or control group they participated.