Among the significant contributions that have resulted from this approach to modeling and analysis of defeasible reasoning, formal basis for negotiation and dialogue processes in multiagent systems, and use the theory of argumentation in AI applications that are not well explained by traditional logic, for example, interpret and process classical treatment utilization Argumentation Theory in terms of computing has led to a rich exchange of ideas among researchers from disciplines such as Philosophy, Linguistics, AI and Economics. The papers in this book, presented as part of an International Conference on Computational Models Argument (comma) in September 2006, provides a valuable ongoing issues and concerns of research in this field. IOS Press is an international scientific, technical and medical publisher of high-quality books for academics, scientists, and professionals in all fields.