This book has everything the student needs. The survey of the literature is thorough and each study is related to the core "big issues" of language balance, language differentiation, lexical overlap, and language interaction. De Houwer explains in detail the use of important tools such as auditory preference measures, the Communicative Development Inventory, and the CHILDES bilingual database in ways that will allow the student to begin real research projects. The exposition is crowned by a final Chapter on what it means for two languages to exist harmoniously in the young bilingual. This is a masterful Introduction to one of the fastest growing areas in language studies.Brian MacWhinney, Department of Psychology, Carnegie Mellon University, USAThe study of bilingual first language acquisition has truly come of age with the publication of a first textbook devoted to this fascinatingtopic. De Houwer's highly readable volume is both comprehensive and stimulating in its presentation of various aspects of bilingual languagedevelopment - a must-read for students embarking on this field of research.Elizabeth Lanza, Department of Linguistics and Scandinavian Studies, University of Oslo, NorwayA timely contribution to a field gradually coming into its own, this is the first textbook to focus on bilingual first-language eLl) acquisition. With its userfriendly presentation, this volume should be accessible to an interdisciplinary readership and could help to popularize the field.Virginia Yip, Chinese University of Hong Kong in Studies in Second Language Acquisition, Volume 32, Number 3, September 2010