This is the first book to collect together work in the field of expertise in second language learning and teaching. It features topicality and originality: there is much current research and professional interest in expertise in learning and teaching and this is the first book to collect together work in this field. It suggests many areas for future empirical research about how experts behave in specific areas. It is an expertise approach that has huge potential relevance for the teaching of languages, and for teacher training. It presents a top-class list of contributors from the main markets and research areas.Understanding what constitutes expertise in language learning and teaching is important for theoretical reasons related to psycholinguistic, and applied linguistic enquiry. It also has many significant applications in practice, particularly in relation to the training and practice of language teachers and improvements in students' strategies of learning. In this volume, methodologies for establishing what constitutes expert practice are discussed and the contributions address the fields of listening, reading, writing, speaking and communication strategies, looking at common characteristics of the 'expert teacher' and the 'expert learner'.