The empirical analysis of party organizations and party organizational change has long remained one of the least developed fields of study in comparative politics. Despite much discussion about the supposed 'crisis of party' and the 'decline of party' in Western Democracies, we still know remarkably little about what goes on inside political parties. How Parties Organize takes a close look inside political parties, bringing together the findings of an international team of leading scholars. Building on a unique set of cross-national data on party organizations, the contributors explain how parties organize, how they have changed, and how they have adapted to the changing political and organizational circumstances in which they find themselves. Offering the most systematic and comprehensive analysis of how parties organize in contemporary Europe and the United States, this volume is essential reading for scholars and students of comparative politics and party politics.