Adrián Albala, Ph-D in Political Science (Sorbonne University, Paris 3, France). Assistant professor at the Institute of Political Science of the University of Brasilia (Brazil). His research deals with coalition politics in Presidential Regimes, Latin American Party Systems and Political Representation. Josep Maria Reniu Ph-D in Political Science (University of Barcelona, Spain). Associate Professor in Political Science and Head of Department of Government and Policy, University of Barcelona (Spain). Director of the Observatory of coalition governments in Spain (OGC). His research deals with coalition politics in Spain and Parliamentary Regimes.