A thoroughly updated edition of this prize-winning readable introduction to the main theories of first & second language acquisition. This book introduces you to some of the language acquisition research that will help you not just to evaluate existing materials but also to adapt & use them in a way that fits what we currently understand about how languages are learned. -Content including new research & new areas in pedagogy to provide an up-to-date & comprehensive overview of research in the field.-Chapter Preview s & Summaries with round-up questions.-Companion website with vodcasts content updates & shared user content.-Also available as an e-book.