The strength of partisanship is a matter of historic importance and debate in modern democracies. Based on cutting-edge global data, the Research Handbook on Political Partisanship argues that partisanship is down, but not out, in contemporary societies. Contributors focus on four key areas of research: the role and importance of partisanship for democratic rule; how to measure and secure data on partisanship; explanations of the origins and development of partisanship; and the effects of partisanship on citizens' attitudes and behaviours, and on the function of democratic systems....