In this book, Rick Stiggins calls for the ground-up redevelopment of assessment in U.S. education. Speaking from more than 40 years of experience in the field-and speaking for all learners who hope to succeed, the teachers who want them to succeed, and the local school leaders whose aspirations for success have been thwarted by assessment traditions-Stiggins maps out the adjustments in practice and culture necessary to generate both accurate accountability data and the specific evidence of individual mastery that will support sound instructional decision making and better learning in the classroom.