Now in its sixth edition, this bestselling textbook remains the cornerstone for the study of second language acquisition, providing a comprehensive yet accessible introduction to SLA. This substantially revised and updated edition has been edited into ten chapters, with a focus on the most frequently taught core themes and increased accessibility. A new introductory chapter provides a concise overview of the history of the field. Omitted chapters are available online where supplementation is desired. The text continues to provide a rich range of pedagogical tools that encourage students to reflect upon the experiences of second language learners. As with previous editions, discussion questions and problems are peppered throughout each chapter to help students apply their knowledge, and a glossary defines and reinforces must-know terminology. Additional questions and problems appear on the online companion website. This seminal text is ideal core reading for SLA courses in second language studies, applied linguistics, linguistics, TESOL, and/or language education programs. This textbook is supported with Instructor and Student Resources, including PowerPoint slides, exercises, flashcards, audio and video links: www.routledge.com/cw/gass.