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From Agents to Artifacts Back and Forth: Purposive and Doxastic use of Artifacts in MAS Piunti, Michele Ricci, Alessandro MAS Cognitive Agent Agents and Artifacts Interaction Reasoning Environments Recent approaches in Multi-Agent Systems are focusing on providing models and methodologies for the design of environments and special purpose tools supposed to scale up complexities. Among others, the Agents and Artifacts (A&A) approach introduced the notion af artifact as first class abstraction providing agents with external facilities, services and coordination medium explicitely conceived for easing their activities. In this paper we analyse A&A systems by focusing on the functional roles played by artifacts. In particular, we here investigate the function of artifacts once they are employed in the context of societies of cognitve agents, i.e. agents capable to reason about their epistemic and motivational states. In this context, a twofold kind of interactions is envisaged. On the one side, artifact rapresentational function allows agent to improve epistemic states, i.e., by representing and sharing strategic knowledge in the overall system (doxastic use ). On the other side, artifacts operational function allows agents to improve the repertoire of actions, i.e., by providing additional means which can be purposively triggered by agents to achieve goals (operational use ). Some of the outcomes of this approach are discussed along with test cases showing agents engaged in goal-oriented activities relying on the transmission of relevant knowledge and the operations provided by artifacts. Schloss Dagstuhl – Leibniz-Zentrum für Informatik Michele Piunti and Alessandro Ricci 2008 Is Part Of Dagstuhl Seminar Proceedings, Volume 8361, Programming Multi-Agent Systems (2008) InProceedings Text doc-type:ResearchArticle publishedVersion application/pdf doi:10.4230/DagSemProc.08361.6 urn:nbn:de:0030-drops-16423 https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.08361.6 eng https://creativecommons.org/licenses/by/4.0/legalcode