Trust in Agent Societies 11th International Workshop, TRUST 2008, Estoril, Portugal, May 12 -13, 2008. Revised Selected and Invited Papers - Falcone, Rino; Barber, Suzanne K.; Sabater-Mir, Jordi; Singh, Munindar P. (Springer Berlin Heidelberg : Imprint: Springer, 2008)