This groundbreaking collection showcases Jenny Cheshire's influential work in bringing greater attention to quantitative analysis of socio-grammatical variation and builds upon her contributions with new lines of inquiry pushing sociolinguistic research forward. Featuring contributions from leading experts in the field, the volume is structured in six parts with a particular focus on syntactic, morpho-syntactic, and discourse-pragmatic variation and change, each section turning a lens on a different aspect of socio-grammatical variation. The first sections of the volume focus on the role of structure, its relevance for sociolinguistic production and perception and the impact of social structure on formal structure. Two sections look at the interface of variationist research with other aspects of linguistic research, including generative syntax and discourse-pragmatic features. The final sections consider the importance of integrating broader external factors in socio-grammatical variation, exploring the impact of interactional pressures in the sociolinguistic environment and the role of multi-ethnic contact varieties. Taken together, this volume demonstrates the critical role of socio-grammatical variation in our understanding of language change as a holistic process.