About five years ago, states across the country took on the huge, complex task of developing and implementing new systems to evaluate teacher and principal performance in public schools. In response to a federal mandate aimed at improving student achievement, especially in the lowest performing schools, state boards of education drafted high-level educator evaluation frameworks that called for the use of multiple evaluation measures, including growth in student achievement. But models of effective systems were scarce, and state and local education agencies were looking for ideas and guidance. This digest issue features work that REL West is doing in partnership with the West Comprehensive Center to provide data analysis and technical assistance services to the West Region states of Arizona, Nevada, and Utah, through the Educator Effectiveness Alliance. Members include state specialists in leadership, instruction, evaluation, and assessment. The issue also includes links to educator effectiveness publications from REL West and other RELs.