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This paper presents a dialogue system called Lorenzen-Hamblin Natural Dialogue (LHND), in which participants can commit formal fallacies and have a method of both identifying and withdrawing formal fallacies. It therefore provides a tool for the dialectical evaluation of force of argument when players advance reasons which are deductively incorrect. The system is inspired by Hamblin's formal dialectic and Lorenzen's dialogical logic. It offers uniform protocols for Hamblin's and Lorenzen'sdoi:10.1007/s10503-014-9324-4 fatcat:ue6jv7af65c3fbwinktgcpgome