The document discusses how principals and teachers in changing schools are blurring boundaries between leading, learning, and teaching. Their schools have high levels of leadership throughout the organization. Teacher leadership capacity is fostered through job-embedded professional development that helps teachers grow in their profession. School leaders create a culture of using data to improve instructional practices. The quality of teacher leadership depends on individual teachers' skills, attitudes, and behaviors. Cultivating teacher leadership may encourage experienced teachers to remain in the profession.