This series is designed to provide a source of reference for both language teachers and teacher trainers. Each title is intended to serve both as a basis for courses and seminars, and as a longer-term reference text for the working teacher's bookshelf. This is a completely revised and updated edition of this readable introduction to the study of language acquisition. By understanding how languages are learned, teachers will be more able to judge the merits of different teaching methodologies and textbooks, and make the most of the time they spend with learners. How Languages are Learned provides a clear introduction to the main theories of first and second language acquisition and, with the help of activities and questionnaires, discusses their practical impllications for language teaching.