"This is an exciting contribution to second language studies and is an invaluable resource. The collection represents an intelligently edited, probing and innovative set of studies balanced between social and psychological insights and pointing to many new research possibilities" - Professor Ronald Carter, University of Nottingham and Chair, British Association for Applied Linguistics. This book presents new research in the field of language acquisition and development, and covers a wide-range of languages and contexts. The contributors pay attention to first language development and other language acquisition (second, foreign and additional), and focus on issues directly relevant to both areas of investigation. One of the main aims of the book is to discover how research and practice in first language development can contribute to the teaching and learning of other languages, and vice versa. The book is distinctive in this area in its application of theoretical findings to the development of principles, objectives and procedures for language learning. "Language Acquisition and Development" will be of interest to postgraduates and academics researching language acquisition, language development and applied linguistics and to language teachers with an interest in language learning theory.