| Special Workshop Title: | Law, Morality, Politics, Defeasibility |
| Author: | Bart Verheij, Department of Metajuridica, Universiteit Maastricht |
| Paper Title: | Artificial Argument Assistants for Defeasible Arguments |
| Abstract: | The present paper discusses experimental argument assistance tools. In contrast with automated reasoning tools, the focus is not on replacing reasoning, but on guiding the argument production of users. Two systems are presented, ARGUE! and ARGUMED based on DEFLOG. The focus is on defeasible argumentation with an eye on the law. Argument assistants for defeasible argumentation naturally correspond to a view on law application as a kind of dialectical theory construction. The experiments provide insights into the design of argument assistants, and show pros and cons of different ways of representing argumentative data. The development of the argumentation theories underlying the systems has culminated in the logical system DEFLOG, that formalizes the interpretation of prima facie justified assumptions. DEFLOG introduces an innovating use of conditionals expressing support and attack. This allows the expression of warrants for support and attack, making it a transparent and flexible system of defeasible argumentation. |
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