This book investigates the key role of linguistic awareness in third language acquisition. This book discusses cognitive and psycholinguistic aspects of third language acquisition and trilingualism, and explores the key role of linguistic awareness in multilingual proficiency and language learning. Ulrike Jessner contributes to the current discussion of multilingualism with English in Europe and beyond, as well as the understanding of multilingual speech processing. Her study is particularly relevant given the widespread acquisition of English by those who are already bilingual or are also acquiring a regional lingua franca. The author supports a dynamic view of multilingualism by stressing the cognitive advantages that the contact with more languages can offer and uses this approach as the basis for future language teaching and learning. Chapters cover topics such as performing in a third language, metalinguistic awareness in multilinguals and in multilingual education, and English as a third language in Europe.