Presentation of the following papers: 1) A Role-based Infrastructure for the Management of Dynamic Communities, by Alberto Schaeffer-Filho, Emil Lupu, Morris Sloman, Sye-Loong Keoh, Jorge Lobo, Seraphin Calo (U.K., U.S.A.) 2) PSH: A Private and Shared History-based Incentive Mechanism, by Thomas Bocek, Wang Kun, Fabio Victora Hecht, David Hausheer, Burkhard Stiller (Switzerland, China) 3) Cooperation under Scarcity: The Sharer's Dilemma, by Michael Rogers, Saleem Bhatti (U.K.)