Re-examines research literature supporting the idea that infants and young children simultaneously learning two languages mix elements from the two languages. It is argued that, contrary to most extant interpretations, bilingual children develop differentiated language systems from the beginning and are able to use their developing languages in…

This article reviews findings from scientific research that has been conducted in the United States since 1980 on the educational outcomes of English language learners (ELLs). The studies selected for review here are a subset of a more comprehensive body of research conducted during this period that is reported in Genesee, Lindholm-Leary,…

This handbook provides a comprehensive, theoretical framework and practical guide to implementing, evaluating, administering, and maintaining a successful dual language instruction program. Practical tools include sample lessons, evaluation checklists, tables, and charts. Also provided are a list of reference materials, useful organizations,…