In order to address the federal "No Child Left Behind Act", the state of Oklahoma required that all public schools address the problem of bullying. Although numerous anti-bullying programs exist, few have been evaluated to determine their effectiveness. The present study evaluated the effectiveness of one such program, "Bullyproof," in a sample of elementary students in a southwestern U.S. urban school district. The evaluation included tracking the frequency of observed bullying and attitudes toward bullying from pre-program to 5 months post-program. The study also included an assessment of participants, satisfaction with the program. At 5 months post-program, results indicated little change in frequency of observed bullying behaviors, although attitudes changed significantly toward an increased anti-bullying perspective and greater perceived power to intervene in bullying. Overall, participants rated the evaluation positively. Implications for future research efforts and programmatic efforts are discussed. (Contains 5 tables.)