作者: Karen Hammerness

LINDA DARLING-HAMMOND, president of the Learning Policy Institute, is the Charles E. Ducommun Professor of Education Emeritus at Stanford University. She is the award-winning author of numerous books including Beyond the Bubble Test: How Performance Assessments Support 21st Century Learning, and Powerful Teacher Education: Lessons from Exemplary Programs (Jossey-Bass). DION BURNS is a senior researcher with the Learning Policy Institute and research analyst at the Stanford Center for Opportunity Policy in Education.