Principals are key to improving schools, but too often the programs that train them don’t adequately prepare principals for the challenges they will face leading schools. One way to change this is for school districts and training providers to work together so programs can better understand and respond to the needs of the schools their graduates will lead. How can such partnerships be forged and strengthened? This tool, the Partnership Effectiveness Continuum (PEC), can be used to gauge partnerships in areas such as the quality of their communications and collaboration and is meant to help guide district-training provider discussion and planning, so districts and programs can work together constructively. The PEC is part of a suite of Quality Measures™ tools and protocols, developed by EDC and funded by The Wallace Foundation to guide and support the collaborative self-assessment of principal preparation and training program quality by school districts and their partners.