There is little agreement among school leaders on what constitutes quality teaching and how best to support teachers in improving lessons, assessments, and classroom instruction. This book will show how principals and other school leaders can 'grow' the expertise of teachers to deliver high quality instruction that serves all students well. It introduces principals to a five-part model of effective instruction. It then shows leaders how to make use of this framework for guiding new and veteran teachers on improving lessons, instruction, and other aspects of classroom practices.