@conference {33, title = {Importance and Properties of Roles in MAS Organization: A review of methodologies and systems}, booktitle = {in Proc. of the workshop on MAS Problem Spaces and Their Implications to Achieving Globally Coherent Behavior (AAMAS 02)}, year = {2002}, month = {00/2002}, address = {Bologna, Italy}, author = {I. Partsakoulakis and G. Vouros} }