Abstract
This paper presents a comparison of various fuzzy expert system shells and describes the development of a fuzzy expert system shell intended for Arab users. The purpose of this shell is to provide Arab users with the ability to develop fuzzy expert systems using a simple Graphical User Interface. The shell is regarded as a general purpose shell. It is based on the implication methods: Rs, Rg, Rgs, Rgg, Rsg, Rss.