This book brings together interesting contributions in Social Choice Theory of important researchers in the field. To mention: Steven Brams, William Gehrlein, Wulf Gaertner, Michel Grabisch, Bernie Grofman, Herman Monsuur, Hannu Nurmi, Hans Peters, Ton Storcken, Martin Van Hees, Donald Saari and Maurice Salles. The contributions show actual research topics in social choice and bring the reader to the state of the art in the theory. The book's richness and diversity is a reflection of the seminars and workshops held by the Dutch Interuniversity Group at the Tilburg University in The Netherlands. Because of its richness and state-of-the-art overview, it can be used for teaching in, e.g., micro-economics, public choice, political theory, and public finance at the Master and Ph.D level.