Phillips: Great teachers are the most important school-based ingredient for student success. So we’re committed to ensuring teachers have the supports and tools they need to continually improve their practice. As we do so, we’re listening closely to what teachers say and co-designing and researching new approaches with them. Through the Measures of Effective Teaching study, we’re working with 3,000 teachers in seven districts around the country to look at multiple measures for understanding what makes a good teacher so that all teachers can improve. We’ve also made deep investments in four sites — Memphis, Tenn.; Hillsborough County, Fla.; Pittsburgh, Pa.; and a group of charter management organizations in Los Angeles — that are dramatically rethinking how they recruit, develop, and retain teachers, particularly for