This is the seventh volume in the highly acclaimed “Sociolinguistics in Deaf Communities” series published by Gallaudet University Press. This volume is the first major attempt to document and analyze linguistic variation in American Sign Language (ASL). Based on seven years of research spread across the United States, including data collected from seven sites (Staunton, VA; Frederick, MD; Boston, MA; New Orleans, LA; Fremont, CA; Olathe, KS, and Kansas City, MO, together; and Bellingham, WA), Sociolinguistic variation in American Sign Language is a major contribution to the growing literature on the linguistics and sociolinguistics of ASL. It seeks to “provide a comprehensive description of the variables and constraints at work in sign language variation” (p. xv), building on the existing linguistic literature dealing with ASL. It succeeds admirably, if not in providing the final word on these complex issues, then by offering not only fascinating insights into sign language variation but also an empirical database that is unmatched in its depth and breadth in the field.