Argumentation in Multi Agent Systems (vol. # 4049) : Second International Workshop ArgMAS 2005 Utrecht Netherlands July 26 2005 Revised Selected and Invited Papers Invited Lecture The Case of Pragma Dialectics Foundations A Logic of Abstract Argumentation On the Meta logic of Arguments Nested Argumentation and Its Application to Decision Making over Actions Testing Formal Dialectic Negotiation Formal Handling of Threats and Rewards in a Negotiation Dialogue Argument Based Negotiation in a Social Context Practical Strategic Reasoning and Adaptation in Rational Argument Based Negotiation A Protocol for Arguing About Rejections in Negotiation Protocols New Types of Inter agent Dialogues Argumentation Based Modelling of Embedded Agent Dialogues Liberalizing Protocols for Argumentation in Multi agent Systems Protocol Synthesis with Dialogue Structure Theory Deliberation and Coalition Formation An Argumentation Based Model for Reasoning About Coalition Structures Argumentation Based Multi agent Dialogues for Deliberation Consensus Formation Presentation of Arguments and Counterarguments for Tentative Scientific Knowledge Towards a Formal Framework for the Search of a Consensus Between Autonomous Agents Argumentation Supported Information Distribution in a Multiagent System for Knowledge Management How Agents Alter Their Beliefs After an Argumentation Based Dialogue.