Providing a solid foundation in second language acquisition this book has become the leading introduction to the subject for students of linguistics psychology & education & trainee language teachers Now in its third edition the textbook offers comprehensive coverage of fundamental concepts including second language acquisition (SLA) in adults & children in formal & informal learning contexts & in diverse socio-cultural settings & takes an interdisciplinary approach encouraging students to consider SLA from linguistic psychological & social perspectives Each chapter contains a list of key terms a summary & a range of graded exercises suitable for self-testing & class discussion The third edition has been revised throughout & features new material on the practical aspects of teaching language along with updated online resources including new classroom activities to accompany each chapter as well as updated references & further reading suggestions