The New Handbook of Second Language Acquisition is a thoroughly revised, re-organized, and re-worked edition of Ritchie and Bhatia's 1996 handbook. The work is divided into six parts, each devoted to a different aspect of the study of SLA. Part I includes a recent history of methods used in SLA research and an overview of currently used methods. Part II contains chapters on Universal Grammar, emergentism, variationism, information-processing, sociocultural, and cognitive-linguistic. Part III is devoted to overviews of SLA research on lexicon, morphosyntax, phonology, pragmatics, sentence processing, and the distinction between implicit and explicit knowledge. Part IV examines neuropsycholgy of SLA, another on child SLA, and the effects of age on second language acquisition and use. Part V is concerned with the contribution of the linguistic environment to SLA, including work on acquisition in different environments, through the Internet, and by deaf learners. Finally, Part VI treats social factors in SLA, including research on acquisition in contact circumstances, on social identity in SLA, on individual differences in SLA, and on the final state of SLA, bilingualism.