This new edition of R. A. Hudson's Sociolinguistics will be welcomed by students and teachers alike. To reflect changes in the field since publication of the first edition in 1980, the author has added new sections on politeness, accommodation, and prototypes; and he has expanded discussion of sex differences in language use, and the relationship between language and thought. Ample coverage of classic topics such as varieties of language, speech as social interaction, the quantitative study of speech, and linguistic and social inequality, remains.