'Native speakers' and 'native users' are terms traditionally used to differentiate between speakers who have acquired a language from birth and speakers who have learnt a second language. This book highlights the problems associated with making such a clear cut distinction. By analysing a range of literature, language uses and proficiency tests, Davies argues that there is no significant difference between native speakers and native users, and emphasises the importance of the Standard Language. Whilst individual native speakers may vary considerably, the academic construct of the native speaker is isomorphic with the Standard Language which is available to both native speakers and native users through education. In this book, Davies explores the 'native user' as a second language speaker who uses language with 'native speaker' competence. This book will be of significant interest to students and researchers working in the fields of second language acquisition and applied linguistics.