School principals are charged with complex responsibilities that can include developing a school vision and culture, supporting teacher effectiveness, managing challenges and crises, communicating with the greater community, and more. However, recent research and surveys of school administrators indicate that principal preparation programs do not adequately prepare graduates to cope with school realities. In response to concerns about the state of initial principal preparation, The Wallace Foundation established the University Principal Preparation Initiative (UPPI), a four-year effort to redesign seven universities' principal preparation programs according to evidence-based principles and practices. Each university collaborates on the redesign with high-need school districts and a state partner, and is supported by a mentor program. This report focuses on the implementation of UPPI in its first year, from fall 2016 to fall 2017. The authors report on UPPI progress and identify cross-cutting themes in the UPPI implementation effort that can help other university principal preparation programs and their partners undertake their own principal preparation system improvement efforts.