In response to a previous article (Bialystok) on perspectives on the development of applied linguistics, this article begins by adding its own perspectives to what has already been offered. The article concludes by discussing the research agenda for the future. (Author/JL)

Argues that further progress in applied linguistics and second-language acquisition will be achieved through collaboration with researchers in other fields. Three examples of research problems are provided that would profit from collaboration with applied linguists: the definition of language proficiency, the neural basis of language functioning,…