HYPO’S legacy: introduction to the virtual special issue

Abstract

This paper is an introduction to a virtual special issue of AI and Law exploring the legacy of the influential HYPO system of Rissland and Ashley. The papers included are: Arguments and cases: An inevitable intertwining , BankXX: Supporting legal arguments through heuristic retrieval , Modelling reasoning with precedents in a formal dialogue Game , A note on dimensions and factors , An empirical investigation of reasoning with legal cases through theory construction and application , Automatically classifying case texts and predicting outcomes , A factor-based definition of precedential constraint and An improved factor based approach to precedential constraint . After describing HYPO, in this introduction to the special issue I look at various aspects of its influence on AI and Law: the developments led by Rissland at Amherst; the developments led by Ashley in Pittsburgh; the expression of these ideas in terms of rule based systems, and their subsequent formalisation; value based theories, which were inspired by a critique of HYPO; and contemporary approaches which revive the idea of dimensions.

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