THE STUDY OF SECOND LANGUAGE ACQUISITION 2E: PB,This book is an encyclopedic survey of second language acquisition research as it has developed over the last forty years. It provides sections on learner language, the role of the linguistic environment and social context, internal mechanisms, individual learner differences, and the role of instruction. It provides a balanced account by representing a variety of perspectives, including cognitive, linguistic, sociocultural, and neurolinguistic.