In August 2009 the Democratic Party of Japan (DPJ) won a crushing victory over the Liberal Democratic Party (LDP) thus bringing to an end over fifty years of one-party dominance. Around the world the victory of the DPJ was seen as a radical break with Japan s past. However this dramatic political shift was not as sudden as it appeared but rather the culmination of a series of changes first set in motion in the early 1990s. The Evolution of Japan s Party System analyses the transition by examining both party politics and public policy. Arguing that these political changes were evolutionary rather than revolutionary the essays in this volume discuss how older parties such as the LDP and the Japan Socialist Party failed to adapt to the new policy environment of the 1990s. Taken as a whole The Evolution of Japan s Party System provides a unique look at party politics in Japan bringing them into a comparative conversation that usually focuses on Europe and North America.