Book excerpt: With the increasing linguistic and cultural diversity of students in U. S. schools, all teachers, regardless of the content area or grade they teach, need research-based strategies for assisting all students to gain English proficiency. This practical, concise guide shows teachers what they need to know about language, how it is learned, how it is used, and how teaching about it can be incorporated into lessons throughout the curriculum. Understanding Language in Diverse Classrooms offers a model of how learning takes place and describes the critical role of teachers in that model. It includes comparison charts showing how some of the most common heritage languages represented among present-day students compare with English, and it provides examples of hands-on materials including checklists, rating scales, and sample lessons to help teachers prepare to teach all their students in diverse classrooms. Each chapter ends with questions to stimulate discussion and reflection on major chapter points, to enable readers to review and evaluate the information and then integrate it into their own practice.