Now in its second edition, this essential textbook and professional development resource offers a new foreword by James Hiebert and two important new chapters that focus on the ways in which the book can be used to support the learning of teachers and administrators, drawing on the authors’ work over the past decade. Chapter 11 illustrates the various ways in which teacher educators or professional developers might use the materials in the book to aid in the professional growth of teachers, including how to directly improve teachers’ instruction practices. Chapter 12 discusses ways in which principals and school leaders can use the book to become better instructional leaders of teachers who are attempting to teach with cognitively demanding tasks.