Parliamentary party groups and their parties: A comparative assessment

This article presents a comparative study of the interrelationship between parliamentary party groups and their extra‐parliamentary party organisations in liberal democracies. Starting with a historical overview of the most important party changes that have taken place since the 1960s, a typology of parliamentary party/party organisation relations is suggested. The following variables are identified as being of particular importance in shaping the structure of power in political parties: position of parliament in the political system; (non‐)existence of the incompatibility rule; effects of the electoral system; competition structure and degree of polarisation of the party system; political culture; conditions under which parties emerged; (non‐)existence of public funding for parties; degree of professionalisation of the political elite.