Fifteen articles review code-switching in the four major areas: policy implications in specific institutional and community settings; perspectives of social theory of code-switching as a form of speech behavior in particular social contexts; the grammatical analysis of code-switching, including factors that constrain switching even within a sentence; and the implications of code-switching in bilingual processing and development. Chapters are: "Introduction: Code-switching and Bilingualism Research (Lesley Milroy and Pieter Muysken); "Bilingual Speech of Migrant People" (Louise Dabene and Daniele Moore); "Code-switching in the Context of Dialect/Standard Language Relations" (Anna Giacalone Ramat); "Code-switching in Community, Regional, and National Repertoires: The Myth of the Discreteness of Linguistic Systems" (Penelope Gardner-Chloros); "Code-switching in the Classroom: Two Decades of Research" (Marilyn Martin-Jones); "The Pragmatics of Code-switching: A Sequential Approach" (Peter Auer); "A Social Network Approach to Code-switching: The Example of a Bilingual Community in Britain" (Lesley Milroy and Li Wei); "Code-switching and the Politics of Language" (Monica Heller); "Code-switching and Grammatical Theory" (Pieter Muysken); "Patterns of Language Mixture: Nominal Structure in Wolof-French and Fongbe-French Bilingual Discourse" (Shana Poplack and Marjorie Meechan); "A Lexically Based Model of Code-Switching" (Carol Myers-Scotton); "A Psycholinguistic Approach to Code-switching: The Recognition of Guest Words by Bilinguals" (Francois Grosjean);"Code-switching in Bilingual First Language Acquisition" (Regina Koppe and Jurgen M. Meisel); "The Code-switching Behaviour of Adults with Language Disorders--with Special Reference to Aphasia and Dementia" (Kenneth Hyltenstam); and "Conclusion: Code-switching Research as a Theoretical Challenge" (Andree Tabouret-Keller). (Contains chapter references.) (NAV)