Ideology, Party Factionalism and Policy Change: An integrated dynamic theory.

Operationalized as a simulation and checked against 1,737 policy shifts in twenty-four post-war democracies, this theory of party position-taking offers both an explanation and specific postdictions of party behaviour, synthesizing some previous approaches and linking up with mandate theories of political representation. These wider implications are considered at the beginning and the end of the article. [ABSTRACT FROM AUTHOR]