The much anticipated revision of this bestselling textbook offers a comprehensive, state-of-the-art overview of SLA. Continuing the previous editions’ successful tradition of a clearly written and illustrated presentation, an emphasis on empirical findings, and the most up-to-date research, the third edition offers a new chapter, "SLA and Related Disciplines," discussing multilingualism; and new sections about the relationship between L1 and L2 acquisition, language transfer, sociocultural theory, and working memory. Its accessible format is designed for use in the introductory second language acquisition course taken by undergraduate and graduate students studying second language acquisition or applied linguistics in a variety of departments.