ent Artificial Immune Systems (MAAIS) for Intrusion Detection: Abstraction from Danger Theory Chung-Ming Ou, C.R. Ou Ants-like Agents: a Model and Analysis Based on Natural Ants Behavior Mohamed Hamada Simulated Annealing for Multi-Agent Coalition Formation Helena Keinänen Structural Changes in an Email-based Social Network Krzysztof Juszczyszyn, Katarzyna Musiał Concept of a Multi-Agent System for Assisting in Real Estate Appraisals Tadeusz Lasota, Zbigniew Telec, Bogdan Trawiński, Krzysztof Trawiński Learning as Meaning Negotiation: a model based on English Auction Elisa Burato, Matteo Cristani An Approximate Model for Bidders in Sequential Automated Auctions Erol Gelenbe, Kumaara Velan Agent-Based Modeling of a Mobile Robot to Detect and Follow Humans José M. Gascueña, Antonio Fernández-Caballero Component Based Approach for Composing Adaptive Mobile Agents Kutila Gunasekera, Arkady Zaslavsky, Shonali Krishnaswamy, Seng Wai Loke A Ratio-based Update Scheme for Mobile Agent Lo...