📕 This new book recognizes the reality that all principals are responsible for supervision,evaluation, and professional development of their teachers-tasks that areneither simple nor without conflict. The primary audience of this text is aspiringand practicing principals. We hope to help them understand both the theory andpractice of supervision, evaluation, and professional development. Observinginstruction, collection data for reflection, and having conversations about teachinghowever, are not sole provinces of principals. Master teachers, teacher leaders,and teacher colleagues can also benefit from the Supervisory sections of thebook, especially the chapters on high-quality instruction, improving instruction, and the classroom data collectingtools.