A 3-day outdoor adventure training program for an experimental group of Resident Assistants (RAs) at Pennsylvania State University was implemented to determine the effects of such a program on group cohesiveness and self-confidence. There were 60 subjects in the control group and 55 in the experimental group; 59% of the control group were male and 70% of the experimental group were female. While the control group participated in regular "in house" training, the experimental group participated in a 1-day orientation program followed by a 3-day adventure program which consisted of hiking, caving, swimming, and group problem-solving tasks. All facets of the usual RA training program were retained for both groups. The Moos and Humphrey Group Environment Scale and the Vegega Supervisory Self-Confidence Scale were administered prior to training, on the day following the program, and 11 weeks later. Results indicated that the program was effective in developing and sustaining group cohesiveness, that this group cohesiveness was sustained over time, that it was not effective in developing greater self-confidence than the regular program, and that the effectiveness of the program was differentiated in certain respects by the sex of the participant. (CM)