Background -- Elements of a Plan-Based Theory of Speech Acts -- Agent Communication Languages: Rethinking the Principles -- Negotiation as a Metaphor for Distributed Problem Solving -- Current Trends -- Verification and Compliance Testing -- Process Algebra for Agent Communication: A General Semantic Approach -- Hierarchical Information Combination in Large-Scale Multiagent Resource Management -- A Perspective on Multiagent Coordination Models -- Argumentation-Based Communication between Agents -- Interaction Protocol Engineering -- An Organisational Approach to the Design of Interaction Protocols -- Design Agent Interaction as a Service to Agents -- A FIPA Compliant Goal Delegation Protocol -- Communication for Goal Directed Agents -- When Are Two Protocols the Same? -- Dialogue Game Protocols -- Request for Action Reconsidered as a Dialogue Game Based on Commitments -- Computational Model of Believable Conversational Agents -- Future -- The Future of Agent Communication.