The papers in this volume have been written by leading scholars in the field of bilingualism and deal with individual bilingualism, societal and educational phenomena, addressing issues such as bilingual usage, acquisition, teaching, and language planning and policy. The volume's major asset lies in its diversity, not only in depth of investigation and in topical variety but also in the range of languages and geographical regions covered. Another important feature of the volume is its multidisciplinary perspective. Among the contributors are linguists, sociologists, psychologists and sociolinguists.