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Social Knowledge in Multi-Agent Systems Pechoucek, M., Marik, V., & Barta, J. (2006a). Role of acquaintance models in agent's private and semi-private knowledge dislosure. Knowledge-Based Systems, 19, 259-271. Pechoucek, M., Tozicka, J., & Rehak, M. (2006b). Towards formal model of adversarial action in multi- agent systems. Proc. of AAMAS'06. New York: ACM Press. Sycara, K. (2001). Multi-agent infrastructure, agent discovery, middle agents for Web services and inter- operation. In Multi-agent systems and applications, LNCS, 2068. Heidelberg: Springer-Verlag. Tichy, P., Slechta, P., Staron R. J., Maturana, F. P., & Hall, K. H. (2006). Multiagent technology for fault tolerance and flexible control. IEEE Trans. on SMC, part C, 36(5), 700-704. Villa, A., Antonelli, D., & Cassarino, I. (2006). A meth- odology for performance analysis of SMEs networks. In Proc. of INCOM'06, vol. 2 (pp.605-610). Multi-Agent Systems (MAS): A group of agents organized according to specific, precisely defined principles of community organization and operation (architecture, style of messaging, and negotiations pro- tocols, etc.), and being supported by an adequate agent platform or infrastructure (registration, deregistration processes, communications support, etc.). Social Knowledge: The available knowledge on the other agents organized and stored locally; this knowl- edge includes the information about the properties, capabilities, resources, reliability, intents, and goals of the other agents and enables to create an efficient society of agents. The self-knowledge is a special kind of the social knowledge. Social Knowledge Provider: An agent which is asked to deliver a piece of knowledge to the other agents and which provides it either on request, periodically or by its own decision. Social Knowledge Requestor: An agent which needs in specific piece of knowledge and contacts the other agents--potential knowledge providers--to provide the required chunk of knowledge in the form of message sending. Social Neighborhood of an Agent: A set of all agents that the agent is aware of, for example, it knows about their existence and properties and is able to com- municate with them. S KEy tERms Acquaintance Model: An appropriate architecture for organizing/structuring and maintenance of social knowledge. Agent-Based Solution: A solution to a decision- making problem which considers the existence of agents as autonomous decision making units contributing to the solution of the problem. (Intelligent) Agents: Autonomous, problem-solv- ing computational units capable of effective behavior in dynamic and open environments. Maintenance of Social Knowledge: All the processes leading to keeping the social knowledge up-dated, for example, by: (1) broadcasting of any change in social knowledge to all the agents (not very practical, rather theoretical approach); (2) periodic revisions when the social knowledge update is invoked as a regular process; (3) subscribe-advertise technique, when individual agents are able to ask for immediate reporting of any change of a selected item character- izing the state or behavior of any other agents. EndnotE 1 We will understand agent's knowledge about his own behavior, status, and commitments, which is usually referred to as agent's self-knowledge, as a special instance of social knowledge. It is very often the case that the agent's self-knowledge is accessible to other agents in the community and it is a part of their social knowledge. 1465