Bully Prevention in Positive Behavior Support (BP-PBS) is a prevention-oriented program created to support students with strategies to combat bullying. BP-PBS supports the idea that all students should have access to positive behavior support to minimize problem behavior at school (Horner, 2011). The goal of this study was to investigate the relationship between the implementation of BP-PBS and a reduction in internal and external stress as well as a reduction in students' perception of bullying behaviors, including physical and verbal aggression among 3rd, 4th, and 5th graders at the elementary study site. The study included Creswell's (2008) triangulation design to answer the following research questions: Is there a statistically significant relationship between the implementation of BP-PBS and a reduction in internal and external stress, as well as a reduction in students' perception of bullying behaviors, including physical and verbal aggression among 3rd, 4th, and 5th graders at the elementary study site? The researcher used triangulation design (Creswell, 2008) statistical analysis to help determine if BP-PBS was the most appropriate bullying prevention program to decrease internal and external stress among 3rd, 4th, and 5th graders at the elementary study site. [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.]