Argumentation and Defeasible Reasoning in the Law

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Marco Billi, Roberta Calegari, Giuseppe Contissa, Francesca Lagioia, Giuseppe Pisano, Galileo Sartor, Giovanni Sartor
J — Multidisciplinary Scientific Journal 4(4), pages 897-914
December 2021

Different formalisms for defeasible reasoning have been used to represent knowledge and reason in the legal field. In this work, we provide an overview of the following logic-based approaches to defeasible reasoning: defeasible logic, Answer Set Programming, ABA+, ASPIC+, and DeLP. We compare features of these approaches under three perspectives: the logical model (knowledge representation), the method (computational mechanisms), and the technology (available software resources). On top of that, two real examples in the legal domain are designed and implemented in ASPIC+ to showcase the benefit of an argumentation approach in real-world domains. The CrossJustice and Interlex projects are taken as a testbed, and experiments are conducted with the Arg2P technology.

keywordsargumentation; defeasible reasoning; tools and technologies; Arg2P
journal or series
book J — Multidisciplinary Scientific Journal (J)
funding project
wrenchCompuLaw — Computable Law (01/11/2019–31/10/2025)