The Social Development Research Group (SDRG) at the University of Washington is partnering with Committee for Children (CFC) to conduct a large-scale school-randomized evaluation of Steps To Respect A School Bullying Prevention Program. In collaboration with the CFC, the SDRG has developed a design and work plan for the evaluation that will allow for a rigorous test of the program, with sufficient statistical power so as to detect even small program effects. The evaluation calls for at least 32 schools, in multiple nationally-representative school districts, to be randomly assigned to intervention or control conditions. Data from students, teachers, and other school personnel will be collected at pretest (i.e., at the beginning of the school year) and posttest (i.e., at the end of the school year) to determine whether schools receiving the intervention experience lower levels of bullying behavior and victimization than do control schools. The Survey Research Division of the SDRG will conduct the data collection and management activities for the evaluation. Data analysis will be conducted by the SDRG. Project dissemination activities will be conducted collaboratively by the CFC and SDRG.