The purpose of the Dissertation in Practice was to explore the experiences and perceptions of a group of middle school teachers and administrators that were implementing a Positive Behavior Interventions and Supports (PBIS) program. The setting for this case study was an urban, Title I middle school located in Florida. Interviews were conducted with both teacher and administrator participants regarding their experiences implementing this program and their perceptions about its effectiveness. Analysis of the data captured from these interviews led to the development of themes for the two groups. Training, competing initiatives and lack of time, the importance of leadership, effectiveness is dependent on the individual, and obstacles to effectiveness were developed for the teachers. The two themes developed for the administrators: consistency is key and teachers limit the program. Implications for the program will be discussed, as will a set of recommendations based on the findings. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://www.proquest.com/en-US/products/dissertations/individuals.shtml.]