Sociolinguistic variation in American Sign Language is the successful result of applying sociolinguistic theory and methodology originally developed for spoken languages to American Sign Language (ASL). The product of several years of study conducted by a team of researchers, this book is more than just an exercise; both expected and unexpected findings are presented, thereby confirming and advancing the sociolinguistics of signed languages in particular and of language in general. Lucas and Valli bring to this work extensive experience with sign language linguistics; they are joined by Bayley, who is known for his work on Tejano English and Spanish variation among immigrants of Mexican descent. The statistical findings provide the necessary bridge between context and environment, on the one hand, and internal constraints, on the other, to explain the range of variation represented at phonological, syntactic, and lexical levels in ASL. Explicitly building on Weinrich, Labov & Herzog's notion of orderly heterogeneity (14, 193–94; cf. Weinrich, Labov & Herzog 1968), the book provides useful examples and analysis for sign language linguists, and it would do well as a source for graduate and advanced undergraduate courses where materials beyond a primer of sociolinguistics are needed. For those more established in the field, the authors respectfully (and graciously) challenge several frequently cited findings concerning variation in ASL, such as Woodward & DeSantis' (1977) claims about negative incorporation and Liddell & Johnson's (1989) explanations for phonological variation in forms of the sign deaf.