This collection of original essays approaches second language acquisition from a linguistic rather than a sociological, psychological, or purely pedagogical perspective. A wide range of viewpoints and approaches is represented; however, all authors agree on the fundamental importance of linguistic theory in the study of second language acquisition. Few works have explored in depth how a second language is acquired and what the second language learner must do mentally to achieve proficiency in another language. The essays in this book provide an incisive analysis of these questions. For greater accessibility, the chapters are arranged topically from those covering the broad area of theories of acquisition to those focusing specifically on syntax, semantics, pragmatics, lexicon, and phonology in another language.