Invited Talks -- Is Computational Complexity a Barrier to Manipulation? -- Games, Norms and Strategic Notions in Information Flow Security -- Group Announcements: Logic and Games (Abstract of Invited Talk) -- Strong Equivalence in Argumentation -- Regular Papers -- Hypergraphs of Multiparty Secrets -- Combining Logics in Simple Type Theory -- Speculative Abductive Reasoning for Hierarchical Agent Systems -- Formal Semantics of a Dynamic Epistemic Logic for Describing Knowledge Properties of ?-Calculus Processes -- What Happened to My Commitment? Exception Diagnosis among Misalignment and Misbehavior -- Verifying Business Process Compliance by Reasoning about Actions -- From Organisation Specification to Normative Programming in Multi-Agent Organisations -- Finding Uniform Strategies for Multi-agent Systems -- Playing Extensive Form Games in Parallel -- Exploring the Boundary of Half Positionality -- Proof-Theoretic Analysis of Rationality for Strategic Games with Arbitrary Strategy Sets -- An Agent Language with Destructive Assignment and Model-Theoretic Semantics -- Model Checking Agent Programs by Using the Program Interpreter -- A Dialogue Games Framework for the Operational Semantics of Logic Agent-Oriented Languages.

This book constitutes the proceedings of the 11th International Workshop on Computational Logic in Multi-Agent Systems, CLIMA XI, held in Lisbon, Portugal, in August 2010. The 14 papers presented were carefully reviewed and selected from 31 submissions. In addition 4 invited talks are presented. The purpose of the CLIMA workshops is to provide a forum for discussing techniques, based on computational logic, for representing, programming and reasoning about agents and multi-agent systems in a formal way. This volume features two thematic special sessions: norms and normative multi-agent systems and logics for games and strategic reasoning.