This book advances research on grammatical change and shows the breadth and liveliness of the field. Leading international scholars report and reflect on the latest research into the nature and outcomes of all aspects of syntactic change including grammaticalization, variation, complementation, syntactic movement, determiner-phrase syntax, pronominal systems, case systems, negation, and alignment. The authors deploy a variety of generative frameworks, including minimalist and optimality theoretic, and bring these to bear on a wide range of languages: among the latter are typologically distinct examples from Germanic, Romance, Slavic, Greek, Korean and Japanese, Austronesian, Celtic, and Nahuatl. They draw on sociolinguistic evidence where appropriate. Taken as a whole, the volume provides a stimulating overview of key current issues in the investigation of the origins, nature, and outcome of syntactic change.