This report highlights 10 of the most advanced and talked-about teacher evaluation systems nationally: Delaware; Rhode Island; Tennessee; Hillsborough County, Florida; Houston, Texas; New Haven, Connecticut; Pittsburgh, Pennsylvania; Washington, DC (referred to throughout just as Washington); Achievement First (a charter management organization, or CMO); and the Relay Graduate School of Education in New York City. Together, these systems serve more than 1.6 million students each year. These are not the only systems taking on this work, but they are trailblazers. None of the sites featured would say they have fully "figured out" teacher evaluation. Nor do the authors hold them up as examples of perfection. Yet they have all worked long and hard to carefully and thoughtfully tackle the most difficult challenges related to developing and implementing a high-quality teacher evaluation system. This report consists of four components: (1) A brief which provides an overview of the report and background on the topics addressed in the other documents, including key questions, implementation options and trade-offs, and key terms; (2) A cross-site analysis that looks across all 10 sites and summarizes key components of their evaluation systems; (3) 10 detailed profiles of the teacher evaluation systems at our featured sites; and (4) A library of documents that are the building blocks of the 10 systems. Individual site profiles contain sources. (Contains 36 footnotes.) [This paper was created with 50CAN and Public Impact. Funding for this paper was provided by H. A. Vance Foundation.]