Denis Bouyssou is a Senior Researcher at CNRS, LAMSADE, UMR7024, Paris Dauphine University, France.
Marc Pirlot is Professor of Mathematics and Operational Research at Faculté Polytechnique de Mons in Belgium.
Didier Dubois and Henri Prade are Senior Researchers at CNRS, IRIT, UMR5505, University of Toulouse, France.