Invited Contributions -- On the Convergence of Structured Search, Information Retrieval and Trust Management in Distributed Systems -- Semantic Methods for P2P Query Routing -- Programming Cognitive Agents -- Workflows and Group Interaction -- Enacting the Distributed Business Workflows Using BPEL4WS on the Multi-agent Platform -- BSCA-P: Privacy Preserving Coalition Formation -- Towards Service Coalitions: Coordinating the Commitments in a Workflow -- Reasoning about Utility -- Modeling Minority Games with BDI Agents – A Case Study -- A Goal Deliberation Strategy for BDI Agent Systems -- Estimating Utility-Functions for Negotiating Agents: Using Conjoint Analysis as an Alternative Approach to Expected Utility Measurement -- The Dynamics of Knowledge -- Reconciling Agent Ontologies for Web Service Applications -- An Agent-Based Knowledge Acquisition Platform -- An Agent Architecture for Ensuring Quality of Service by Dynamic Capability Certification -- Engineering a Multi Agent Platform with Dynamic Semantic Service Discovery and Invocation Capability -- Methodology and Simulation -- Towards a Formal Methodology for Designing Multi-agent Applications -- LEADSTO: A Language and Environment for Analysis of Dynamics by SimulaTiOn -- Agent Tools and Agent Education -- Towards a Distributed Tool Platform Based on Mobile Agents -- The Distributed Weighing Problem: A Lesson in Cooperation Without Communication -- Short Papers -- An Adaptive Reputation Model for VOs -- Realising Reusable Agent Behaviours with ALPHA -- Multi-agent System Specification Using TCOZ -- ABACO, Coordination of Autonomous Entities -- Agent-Based Simulation for Testing Control Software of High Bay Warehouses -- Posters -- Collaborative Agent-Based Knowledge Support for Empirical and Knowledge-Intense Processes -- Experiments in Neo-computation Based on Emergent Programming -- A Framework Based on Multi-agent Systems for Information Retrieval Through Mobile Devices -- CASCOM: Context-Aware Service Co-ordination in Mobile P2P Environments.

This book constitutes the refereed proceedings of the Third German Conference on Multiagent Systems Technologies, MATES 2005, held in Koblenz, Germany, in September 2005 – co-located with the 28th German Conference on Artificial Intelligence (KI 2005). The 14 revised full papers presented together with 5 revised short papers and 5 poster papers were carefully reviewed and selected from 54 submissions. The papers are organized in topical sections on workflows and group interaction, reasoning about utility, the dynamics of knowledge, methodology and simulation, agent tools and agent education.