Graham Room argues that conventional approaches to the conceptualisation and measurement of social and economic change are unsatisfactory. As a result, researchers are ill-equipped to offer policy advice. This book offers a new analytical approach, combining complexity science and institutionalism. Part 1 is concerned with the conceptualisation of socio-economic change. It integrates complexity science and institutionalism into a coherent ontology of social and policy dynamics. Part 2 is concerned with models and measurement. It combines some of the principal approaches developed in complexity analysis with models and methods drawn from mainstream social and political science. Part 3 offers empirical applications to public policy: the dynamics of social exclusion; the social dimension of knowledge economies; the current financial and economic crisis. These are supplemented by a toolkit for the practice of 'agile policy making'. This is a stimulating, provocative and highly original book. It will appeal to academics and students in social and policy studies and to a wide range of scholars in other disciplines where complexity science is already well-developed. It will also be of major interest for decision makers coping with complex and turbulent policy terrains.