This study examines the implementation of Positive Behavior Intervention and Support (PBIS) programs in large urban school districts. Specifically, it looks at one large urban school district in Texas that is implementing PBIS district-wide. The study explores the challenges of implementing PBIS in such districts and the importance of principal involvement. It finds that leadership buy-in from stakeholders is critical to supporting inclusive practices and improving student academic achievement. Principal support and commitment are essential for the behavioral shifts and staff participation required by PBIS programs.