When first published in 1980, Dialectology broke new ground by integrating urban dialectology (sociolinguistics), dialect geography and spatial variation into a cohesive discipline. In this second edition, the authors take account of the renaissance of dialect research in the last twenty years. They offer new sections on dialectometry and mapping variability, a revised section on dialect geography as well as updates of other recent developments. A reliable textbook for over seventeen years, this new edition will continue to serve the needs of undergraduates and individual scholars with its comprehensive coverage of methods, models and findings in the study of language variation and change.