Book excerpt: This collection identifies the main theoretical and methodological issues currently preoccupying researchers in social dialectology, drawing not only on variation in English in the UK, USA, New Zealand, Europe and elsewhere but also in Arabic, Greek, Norwegian and Spanish dialects. The volume brings together previously unpublished work by the world's most prolific and well-respected social dialectologists as well as by some younger, dynamic researchers. Together the authors provide new perspectives on both the traditional areas of sociolinguistic variation and change and the newer fields of dialect formation, dialect diffusion and dialect levelling.