In any given year, educators are inundated with innumerable products and processes that promise to advance the academic or social-emotional development of their students. Publishers often describe the great potential benefits of implementing a new approach or process yet often do not discuss how to sustainably implement in a way that fits the specific context. Thoughtful program implementation and evaluation remain essential to ensuring success, especially when a district or school decides to take up the challenges of becoming a trauma-informed school, an innovation with myriad strategies and programs that, when implemented and evaluated with intention, can make a meaningful impact on students, staff, and families. Using the phases of implementation, this chapter discusses the importance of program evaluation and lays out a framework to support district and school efforts in the transformative process of becoming a trauma-informed system.