The Parents Raising Safe Kids Program (PRSK) is a research-based manualized violence prevention curriculum designed to decrease coercive parenting behavior, encourage positive discipline, increase media violence literacy, and increase child development knowledge. This study is a multi-site pre-post comparison evaluation of PRSK's effectiveness with diverse parents, including those who are incarcerated, in drug treatment and both English and Spanish speaking. Results indicate that PRSK was successful at improving media violence literacy, positive parenting behavior, child development knowledge, anger management, and prosocial problem solving. Additionally, PRSK was especially efficacious for Spanish speaking participants, who improved more than English speakers. Due to the need for appropriate and cost-effective programs for underrepresented groups, these results add to the growing evidence base supporting the use of PRSK with diverse parents. PRSK is effective in educating caregivers about nonviolent parenting behavior and child development. It is flexible, focuses on parents of very young children, and is cost effective. The program costs a fraction of other evidence-based practices yet statistical effect sizes for change over time are comparable. (C) 2011 Elsevier Ltd. All rights reserved.