Trust: Theory and Application.- Teammate Selection Using Multi-dimensional Trust and Attitude Models.- Noise Detection in Agent Reputation Models Using IMM Filtering.- Towards Improved Partner Selection Using Recommendations and Trust.- Generalizing Trust: Inferencing Trustworthiness from Categories.- Action-Based Environment Modeling for Maintaining Trust.- Combining Cognitive with Computational Trust Reasoning.- Welfare States and Social Trust: 'Crowding-Out' Dilemma.- A Trust-Based Incentive Mechanism for E-Marketplaces.- An Agent-Based Trust Model for Service-Oriented Systems.- Trust: Formal Models.- Agents Selecting Trustworthy Recommendations in Mobile Virtual Communities.- From Binary Trust to Graded Trust in Information Sources: A Logical Perspective.- Reputation Models.- Using the RePart Simulator to Analyze Different Reputation-Based Partnership Formation Strategies within a Marketplace Scenario.- Art Competition: Agent Designs to Handle Negotiation Challenges.- Towards Reputation Enhanced Electronic Negotiations for Service Oriented Computing.- SOARI: A Service Oriented Architecture to Support Agent Reputation Models Interoperability.- Reputation and Uncertainty Reduction: Simulating Partner Selection.- Experimental Evaluation of Deceptive Information Filtering in Context-Aware Service Selection.

This special issue is the result of the selection and re-submission of advanced and revised versions of papers from the workshop on "Trust in Agent Societies" (11th edition), held in Estoril (Portugal) on May 10, 2008 as part of the Autonomous Agents and Multi-Agent Systems 2008 Conference (AAMAS 2008), and organized by Rino Falcone, Suzanne Barber, Jordi Sabater-Mir, and Munindar Singh. The aim of the workshop was to bring together researchers from different fields (artificial intelligence, multi-agent systems, cognitive science, game theory, and social and organizational sciences) that could contribute to a better understanding of trust and reputation in agent societies. The workshop scope included theoretical results as well their applications in human-computer interaction and electronic commerce. It was constituted by a main session integrated with two others: the first on the formal models of trust, and the second on reputation models. In this volume we present papers from the three workshop sessions: the main s- sion with papers on theoretical and applicative aspects of trust (from a engineering, cognitive, computational, sociological point of view); the formal model session with works in the field of applied logic and applied mathematics; the reputation models session with papers that specifically address models of reputation systems, theo- driven and empirically backed-up guidelines for designing reputation technologies, and analysis and discussion of existing reputation systems.