This volume is dedicated to applied linguistic research on multilingualism. The term “applied linguistics” is used in a broad sense and describes several examples of the cooperation between linguists and public service institutions or commercial companies. Furthermore, renowned scholars in the field discuss how applied linguistics may enhance communication in the workplace, in schools and in public service institutions. The areas of application presented in this volume include intercultural communication, language acquisition, language contact, and sociolinguistic variation. The aim is to highlight the importance of applied linguistic research concerning the deployment of multilingualism, and, furthermore, to stimulate the debate about it. With multilingualism in different social settings being its focus, this volume will appeal to scholars in the fields of Applied Linguistics, Sociolinguistics, Second Language Acquisition, and Pragmatics.