This article presents an example of how school time was monitored to facilitate a cost analysis of school-wide systems of positive behavior support (PBS). The article provides descriptions of how (a) PBS efforts were initiated in the school, (b) time and money were spent preparing for and implementing PBS, and (c) changes in behavior referrals and suspension were used to evaluate the effect of PBS on the larger system. The results indicated a positive assessment of PBS based on predetermined criteria. The discussion focuses on larger issues of cost analyses as systemic evaluation tools for assessing lifestyle change. (Contains 1 figure and 3 tables.)