This book represents the peer-reviewed proceedings of the Third International Symposium on Intelligent Distributed Computing – IDC 2009 held in Ayia Napa, Cyprus during October 13-14, 2009.

The 36 contributions in this book address many topics related to theory and applications of intelligent distributed computing, including: actor-agent systems, agentbased simulation, autonomic computing, computational service economies, defeasible reasoning, distributed data mining, distributed logic programming, e-learning, emergent properties in complex systems, formal methods of intelligent distributed systems, genetic and evolutionary algorithms, information retrieval, knowledge fusion, multi-sensor networks, mobile ad hoc networks, mobile computing, ontologies and metadata, peer-to-peer networks, process modeling and integration, remote sensing distributed systems, secure e-payment systems, social networks, surveillance and disaster management applications, swarm computing, Web services and systems.