With the interest and assistance of more than a dozen key state education leaders and staff from across the country, the Center on Reinventing Public Education (CRPE) is investigating what it would take for states to attract and support talented school leaders. This report explains CRPE's efforts to create a coherent framework that any state could use to draft a strategy for developing and supporting a principal corps for the coming decades. It explains why principals are key to so many of today's education efforts and why now is the time to take action. The report then presents a focused data guide and a framework for thinking about policies that can help states get started. State Principal Data Guide: Data Elements is appended. (Contains 22 footnotes.)