This book draws on the latest social science to explain how and why social policy change occurs. Built on core concepts of policy analysis, it offers a robust framework for understanding policy change that can be applied to any aspect of welfare or social policy. Unlike most work in this field, the book deftly mixes theory and practice--even including discussions of key theorists. This third edition brings the book fully up to date and will ensure that it remains the standard textbook in the field for years to come.