Sofia Stratilaki-Klein is Senior Lecturer at the University of Sorbonne Nouvelle – Paris 3, Associate Professor at the University of Luxembourg and a specialist of Discourse Analyisis and Multilingual Studies. Her research interests include conversational and sociolinguistic issues in L3 acquisition, cross-linguistic interaction in grammar, second language acquisition, learning and communication strategies in multilingual classrooms, multilingual and multicultural identities, linguistic policies and foreign language curricula. Before joining the Department of French as a Foreign Language at Sorbonne Nouvelle University, she taught applied linguistics at the University of Vincennes, the University of Nanterre (France) and the University of Frankfurt (Germany). Dr. Sofia Stratilaki-Klein has published papers and book chapters on the acquisition of French-German bilingualism. She is currently member of the research group DILTEC, vice president of ADEB (Association for the Development of educational bilingualism) and vice Director of the Departement of French As a Foreign Language of Sorbonne Nouvelle. Sie acts as a reviewer and member of scientific comities for several international journals in applied linguistics. Her latest book is Discours et representations du plurilinguisme. Peter Lang, 2011.