This practicum was designed to reduce incidents of harassment among middle school students and increase their sensitivity toward harassment, through both the conflict resolution process of peer mediation and group exercises. To attain this goal the following procedures were developed: (1) a student self-assessment instrument and its pre- and post-administrations; (2) materials for group sessions; (3) an informational brochure for teachers and parents; (4) peer mediators were selected and trained with a marketed program; (5) all peer mediation sessions were scheduled; (6) sessions for peer mediators to strengthen skills were conducted; and (7) student group was formed to develop a building policy on harassment. Analysis of data revealed a 42.2% decrease in students reporting incidents of harassment on the self-assessment instrument, and substantial decrease in undesirable response to some, but not all, attitudinal statements. Peer mediators reported successfully applying to their own lives, the mediation skills they learned. Extensive appendices include all the surveys, instruments, and materials. Contains 37 references. (Author/JBJ)