Administrators and teachers working together plan, execute, and assess professional learning. It is driven by data that pinpoint what students need. It is collective and collaborative within and across buildings, so the quality of instruction improves consistently from classroom to classroom and from school to school. It includes time for teachers to learn from each other, examine research and effective practices, and problem-solve. It demands leadership from teachers as coaches and mentors, while continuing to tap the knowledge of outside experts and resources.