The effectiveness of a peer mediation program in a midwestern, suburban school in the United States was examined. Six classes (one combination secondlthird grade, one third grade, two fourth grades, and two fifth grades) containing 144 students received 9 hr of training in negotiating integrative agreements to their conflicts and mediating their classmates' conflicts. Eighty-three untrained third-, fourth-, and fifth-graders served as a control group. A peer mediation program was implemented. The role of mediator was rotated equally among all class members. A pretestlposttest, experimentallcontrol group design was used. The results indicate that students successfully learned the negotiation and mediation procedures, were able to apply the procedures in actual conflict situations, and maintained this knowledge throughout the academic year. CONFLICTS AMONG STUDENTS in U.S. schools result in destructive outcomes with alarming frequency. In many schools, outbreaks of violent behavior and the presence of weapons are all too common, with estimates indicating that over 25,000 handguns enter schools daily. A quarter of all high school seniors in 1993 reported being threatened with violence (Stop the Violence, 1994).Providing students with a quality education is becoming more difficult as societal influences disrupt the curriculum. Even in schools where weapons are rare, students often try to resolve conflicts by using destructive strategies, such as verbal threats, withdrawal, telling the teacher, and restating demands (Johnson, Johnson, & Dudley, 1992). Most students seem to be unaware and ignorant of steps that would allow them to manage conflicts constructively (Lam, 1989).We thank Pat Erlandson. principal, and the faculty of Creek Valley Elementary School, Edina, Minnesota, for their help and assistance in conducting this study.