Book excerpt: This book is the result of a decade long effort in school districts such as New York City, Austin, and San Diego to implement challenging instruction that is designed for classrooms that include English learners and that raises the bar and increases engagement for all learners. Classroom vignettes, transcripts of student interactions, and detailed examples of intellectually engaging middle school and high school lessons provide a concrete picture of the instructional approach developed by coauthor Aida Walqui, founder and director of WestEd s Quality Teaching for English Learners (QTEL) initiative.