The Center for Equal Opportunity is proud to offer this guide. In it, we attempt to answer the most frequently asked questions about teaching, designing, and evaluating an English immersion classroom and the research underpinnings in favor of English immersion. With the help of this guide, teachers, administrators, and policy makers will reach a better understanding of what structured English immersion is all about, and the special difficulties that affect English-learners at different grade levels, especially older students.