ThesearetheproceedingsoftheGermanconferenceonMultiagentSystemTe- nologies(MATES2003), whichwasthe?rstconferenceorganizedbytheGerman specialinterestgrouponDistributedArti?cialIntelligencetopromotethetheory and application of agents and multiagent systems. Its goals were to cover the whole range from the theory to applications of agent and multiagent technology and re?ect the national and international state of the art. The conference p- vided an excellent interdisciplinary forum for both researchers and members of business and industry to present and discuss the latest advances in theoretical...