Book excerpt: Arabic L2 Interlanguage is a significant and timely addition to the field of Second Language Acquisition, providing valuable insight into the development of ‘interlanguage’, the interim language of early beginners, in learners of Arabic. This book: Clearly establishes what interlanguage is and why it should form an important part of foreign language teaching Presents the reader with a sequence in which six English-speaking learners of Arabic acquire the language Makes use of the rich morphological and syntactic property of Arabic to offer a new perspective on the field of Second Language Acquisition. Arabic L2 Interlanguage contributes directly towards building a more comprehensive theoretical framework for explaining how L2s are acquired. It will be key text for SLA scholars as well as an important resource for graduate students in Linguistics and Foreign Language Teaching.