Buy-in from stakeholders is important for the successful adoption, full implementation and sustainability of any school-based initiative (Fixsen, Naoom, Blase, Friedman, & Wallace, 2005). It's also one of the critical elements for implementation of Tier 1 PBIS included in the TFI, BoQ, and the Blueprint. This brief describes the unique features of high school settings that can make building buy-in more difficult and identifies strategies that have been successful for securing staff buy-in in high schools.