This book deals with bilingual education in general, but it pays special attention to bilingual education in monolingual areas. One central aim is to study the effects of bilingual programmes during the final stages of Primary and Secondary Education in contexts where the L2 (English) is not normally used as an instrument of social communication in the students’ environment, but instead is used only at school, where some subject areas are undertaken totally or partially in this language. The reader interested in bilingual education will find a valuable source of information on different bilingual programmes in the USA and Spain: what schools do and the contents they teach, their timetable and extracurricular activities; the specific objectives that they aim to achieve and the methodology they use, with special reference to the CLIL approach, the schools and the students’ level of success with bilingual education, the most common problems that they have to face in monolingual areas and how to solve them.