The Quality Measures rubric of program domains and indicators together articulate a detailed vision for high-quality principal preparation, carefully based and built on research. It draws on nearly two decades of research about high-quality principal preparation, in general, and the preparation of equity-centered principals.

This 12th edition of the Quality Measures Toolkit is updated to incorporate findings from recent research by the Learning Policy Institute and the RAND Corporation about high quality principal preparation as well as feedback from university- and district-based advisors. It includes updates to the introductory text as well as minor changes to each domain. 

The 12th edition also draws on the knowledge and insights of many people. The contents are drawn from the research base regarding effective, equity-centered principal preparation, including hundreds of research studies, white papers, and frameworks. The toolkit has been informed and improved over the years by multiple rounds of feedback from esteemed colleagues who are deeply knowledgeable about principal preparation and committed to equity.