Prof. LEUNG Kwong SakSo Y.T.Leung, AresAresLeungWong, W.S.FelixW.S.FelixWong2023-03-312023-03-311992Artificial Intelligence In Medicine, 1992, vol. 4 (1), pp. 75 - 8509333657http://hdl.handle.net/20.500.11861/7710An expert system shell (SYSTEM Z-II) based on fuzzy logic and numbers was built in a minicomputer environment. Z-II was proved to be a successful and powerful expert system building tool because it can handle both exact and inexact reasoning. Its third generation, Z-III, is developed in a PC environment and includes some new enhancement features compared to Z-II. In this paper, the development process of Z-III is described. Two medical expert systems in the field of obstetrics have been built successfully using Z-III. A comparative performance evaluation between Z-II and Z-III using a third expert system is given. It is concluded that the implementation of Z-III in a PC environment is not only feasible but also increases user-friendliness and availability of such expert system shells. © 1992.enPeer Reviewed Journal Article10.1016/0933-3657(92)90038-Q