Vicki Phillips from the Bill & Melinda Gates Foundation talks with Learning Forward about the foundation's investment in effective teaching and the role of professional learning. Phillips said great teachers are the most important school-based ingredient for student success. So they are committed to ensuring teachers have the supports and tools they need to continually improve their practice. Through the Measures of Effective Teaching study, they are 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. Their hope is that the Measures of Effective Teaching study will support the creation of teacher development and evaluation systems that give teachers much more accurate, fine-grained information to help improve their practice.