The meeting ofresearchersfrommulti-agentsystems engineeringandthe social/ economic/organizational sciences plays a vital role in the cross-fertilization of ideas, andisundoubtedlyanimportantsourceofinspirationforthebodyofkno- edge that is being produced in the multi-agent ?eld. The MABS series continues to pursue its goal of bringing together researchers interested in multi-agent s- tems with those focused on modelling complex social systems, in such areas as economics, management, andorganizationaland socialsciencesingeneral. This volume is the ninth of its series. It is based on papers...