Institutional politics concern decisions on frameworks of political control. They define the patterns of political decision making which have not only to provide enough potential for policy change but also to satisfy the demands of the concerned people. Since institutional politics imply uncertainty on future decision making, they generate the question how to derive corresponding expectations. The project aims to model institutional politics. The explanatory power will be tested by empirical applications, particularly institutional politics on the European Union. First applications include the Amsterdam reform of the European Union and the institutional consequences of Eastern enlargement.