After decades of experimentation with teaching language minority students, we are still confronted with an achievement gap between these students and their White Anglo counterparts that refuses to close. This gap widens, as students get older. This book is designed to help leadership teams at the school, district, and state levels to develop, implement and evaluate effective programmes for ELLs and all other students. Grounded in the author's extensive research on professional development and effective ELL instruction, the authors describe how professional development programmes integrate language, literacy, and subject matter for better results.