This collection of twelve essays, some of which have been written specifically for this volume by well-known European and North-American sociolinguists, reflects an increasing recognition within the field that sociological and theoretical innocence can no longer be countenanced, and offers a multi-pronged and multi-methodological way to move towards a critical, reflexive, and theoretically responsible socio-linguistics. It explores, with courage and sensitivity, some very important areas in the enormous space between Bloomfieldian 'idiolect' and Chomskyan 'UG' in order to situate the human linguistic enterprise, and offers valuable insights into human linguisticality and sociality. These explorations expose the limits of correlationism, determinism, and positivistic reificationism, and offer new ways of doing sociolinguistics. Intended for both practicing and future sociolinguists, this is an ideal text-book for the times, particularly for graduate and advanced undergraduate students.