Written for students encountering the topic for the first time, this is a clear and practical introduction to second language acquisition (SLA). Using non-technical language, it explains how a second language is acquired; what the learner of a second language needs to know; and why some learners are more successful than others. This new edition of Muriel Saville-Troike's bestselling textbook introduces in a step-by-step fashion a range of fundamental concepts, such as SLA in adults and children, in formal and informal learning contexts and in diverse socio-cultural settings. Taking an interdisciplinary approach, it encourages students to consider SLA from linguistic, psychological and social perspectives. Providing a solid foundation in SLA, this book has become the leading introduction to the field for students of linguistics, psychology and education, and trainee language teachers. Table of Contents 1. Introducing second language acquisition 2. Foundations of second language acquisition 3. The linguistics of second language acquisition 4. The psychology of second language acquisition 5. Social contexts of second language acquisition 6. Acquiring knowledge for L2 use 7. L2 learning and teaching