This research explores the implementation of a school-wide intervention program that was designed to foster and instill intrinsic values based on an external reward system. The Positive Behavior Support in Schools (PBSIS) is an intervention intended to improve the climate of schools using system-wide positive behavioral interventions to discourage disruptive behaviors. The charter school that was the focus of this research experienced high staff turnover, negative school climate and student suspension rates that exceeded the state average. A mixed methods research design included de-identified data that were retrieved from 200 students in grades kindergarten through two, 205 parents and 54 staff members. The data sources included data from the School-wide Evaluation Tool (SET), Climate Survey and Office Discipline Referrals (ODR). Results indicated the implementation of Positive Behavior Support in Schools had a positive and significant impact on improving student behaviors and school climate. Results indicated that the implementation of the program significantly reduced the number of office discipline referrals and in-school suspension rates, and improved perceptions of students, staff and parents regarding the school climate. However, the results also indicated that there was no significant difference in the out-of-school suspension rates during the two-year implementation of PBSIS. This study provided administrators and staff with a comprehensive understanding of the implementation challenges associated with a school-wide intervention, as well as evidence to support practices that were effective.