Recent technological advances in open systems have imposed new needs on multi-agent systems. Nowadays, open systems require open autonomous scenarios in which heterogeneous entities (agents or services) interact to fulfill the system goals. The main contribution of this paper is the definition of an open architecture and computational model for large-scale open multi-agent systems based on a service-oriented approach. This work requires a high-level design of all features and needs for systems of this kind. The new proposed architecture, called THOMAS, is specifically addressed for the design of virtual organizations. A simplified example for the management of a travel agency system, which shows the features of the proposal, is also included.
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