Proc. of FGCS '94, ICOT, Tokyo, December 1994

A Legal Reasoning System : new HELIC-II

Katsumi Nitta, Masato Shibasaki, Tsuyoshi Sakata,

Takahiro Yamaji, Wang Xianchang, Hiroshi Ohsaki (JIPDEC),
Satoshi Tojo (MRI), Iwao Kokubo (MRI) and Takayuki Suzuki (MTC)
Institute for New Generation Computer Technology
4-28, Mita 1-chome, Minato-ku, Tokyo 108, Japan
nitta@icot.or.jp

Abstract:

Legal reasoning is the thinking process adopted by lawyers when they apply legal rules to a new case and draw legal conclusions. In the field of AI and Law, many legal reasoning systems have been developed. However, most of them are focused on generating arguments. Though argument is the most important function of the legal reasoning, without value judgment and debate strategy, we cannot construct a complete model of legal reasoning. The new HELIC-II is a legal reasoning system based on such a complete model. In this paper, we introduce a legal reasoning model capable of value judgment and debate strategy, and give an overview of the new HELIC-II. Especially, we show how legal knowledge is represented in the new HELIC-II illustrated by presenting the solution to an actual case.

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