Bilingualism in Development describes research on the intellectual development of bilingual children, showing how it is different from that of monolingual children. The focus is on preschool children, examining how they learn language, how they acquire literacy skills, and how they develop problem-solving ability in different domains. It is unique in that it assembles a wide range of research on children's development and interprets it within an analysis of how bilingualism affects that development. It is the only book to interpret this large research from a single theoretical perspective, leading to coherent conclusions.