The study of Arabic dialects has been an important and rich area of research over the past thirty-five years or so, with significant implications for modern linguistic analysis. The current volume builds on this tradition with ten scholarly contributions that provide novel data and analyses in multiple areas of Arabic linguistics: Syntax and its interfaces; regional and sociolinguistic variation; and first language acquisition. The linguistic facts in the volume are drawn from the various Arabic dialects spoken in North Africa, Egypt, the Arabian Peninsula, the Levant, and Standard Arabic, and the analyses proposed reflect current approaches in linguistic analysis. The volume, therefore, should be of interest to formal linguists, sociolinguists, historical linguists, dialectologists, as well as researchers on first language acquisition. It is our hope that the papers in this volume will spur more interest in and research on further aspects of Arabic linguistics.