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This paper addresses the structural and behavioral characteristics of multi-agent system (MAS) for Quality of Service (QoS) management using MESSAGE (Methodology for Engineering Systems of Software Agents) modeling language that extends UML (Unified Modeling Language) by contributing agent knowledge level concepts and diagrams with notation for viewing them. Such a multi-agent system is an environment composed of Intelligent Agents (IAs) that ensure guaranteed QoS offered by multi-service communication networks ac cording to Service Level Agreements (SLAs) among users and service providers. A hybrid layered agent architecture that exploits both goal-orientation and reactiveness is designed. It supports flexible and adaptive behavior as well as collaboration among the intelligent agents. It is shown that the applied multi-agent system for QoS management provides transformation of current …