Researchers and school practitioners alike are finding positive outcomes in the proactive practices of schoolwide positive behavior supports (SWPBS). However, reform through such systemic efforts as SWPBS is a challenging endeavor. For SWPBS to reach the widest number of schools, it is necessary to provide school faculty and staff with the knowledge and tools necessary to design and implement effective behavioral supports. "Foundations" is a staff development tool designed to guide school teams through the process of developing positive disciplinary practices consistent to the principles of SWPBS that prevent problem behavior and encourage safety and civility. This paper includes a description of SWPBS and Foundations followed by outcomes from a diverse, urban elementary school. Following one year of implementation, data indicated positive changes in schoolwide behavior and discipline practices. (Contains 4 figures.)