This comprehensive textbook outlines and illuminates the main theories of political parties and party systems. Applying these theoretical approaches to British party politics, Moshe Maor covers all the key subjects of study including: * classification of party definitions * party systems change * party institutionalization * cohesion and dissent * intraparty conflicts and ligislative bargaining * multiparty electoral competition Maor's study highlights the importance of the intraparty arena and actors in understanding the shape and behaviour of political parties, providing essential reading to students of party systems and of British politics.