In this article, I describe studies conducted over 25 years with secondary and post-secondary L2 learners in the United States. The evidence from these studies shows that there are important connections between students' early L1 skills and their L2 aptitude and L2 proficiency and that individual differences in students' L1 skills in elementary…

The interest of the psychologist in bilingualism from its origins in the early 1900's to the present is traced. Bilingualism and intelligence are discussed as well as some recent studies on bilingualism and cognitive development. Several areas where psychologists may provide valuable insights into the process of becoming bilingual are discussed…