Challenging behavior in adults with intellectual and developmental disabilities (IDD) can lead to decreased quality of life and social and community inclusion. Compared to research with children there is relatively limited research on effective behavior support interventions for adults with disabilities. The Prevent-Teach-Reinforce (PTR) program is a standardized, team-based model for positive behavior supports that has been proven effective for younger children and families. Studies of the PTR model have been conducted in K-12 school settings, with young children in preschool settings, and in home/family settings. Documented outcomes include reductions in challenging behaviors and increases in desired behaviors. Social validity data suggest high acceptability of the PTR program by implementers. An initial study on PTR in an adult service context produced promising results regarding decreases in challenging behavior of individuals with IDD, and very high staff acceptability of the PTR program. Research questions for further inquiry into the effects of PTR in adult services are presented. [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.]