Book excerpt: Ever since H.L.A. Hart's self-description of The Concept of Law as an 'exercise in descriptive sociology', contemporary legal theorists have been debating the relationship between legal theory and sociology, and between legal theory and social science more generally. There have been some who have insisted on a clear divide between legal theory and the social sciences, citing fundamental methodological differences. Others have attempted to bridge gaps, revealing common challenges and similar objects of inquiry. Collecting the work of authors such as Martin Krygier, David Nelken, Brian Tamanaha, Lewis Kornhauser, Gunther Teubner and Nicola Lacey, this volume - the second in a three volume series - provides an overview of the major developments in the last thirty years. The volume is divided into three sections, each discussing an aspect of the relationship of legal theory and the social sciences: 1) methodological disputes and collaboration; 2) common problems, especially as they concern different modes of explanation of social behaviour; and 3) common objects, including, most prominently, the study of language in its social context and normative pluralism.