This revised edition of a major textbook provides an introduction to the queries that arise in connection with bilingualism and the effect it has on the personality. It underlines the normality of speaking and using more than one language and aims to dispel many myths and fears. It should interest all types of reader - parents, educators and policy makers, as well as language specialists. Since the first edition the author has spent time in California and is therefore able to give more attention to the needs of American students. He has worked as a specialist consultant to the Directorate General for Science, Education and Research of the Commission of the European Communities and for the Singapore Ministry of Education.