PAUL G. LEWIS is Professor of European Politics at the Open University, UK. His publications include Political Parties in Post-Communist Eastern Europe (2000) and Party Development and Democratic Change in Post-Communist Europe: The First Decade (2001). ZDENKA MANSFELDOV is a Senior Researcher and Head of Department of the Sociology of Politics at the Institute of Sociology, Academy of Sciences of the Czech Republic. Her research focuses on political institutionalization and the representation of interests, both in political terms (parties and parliament) and the non-pol