This report is an abbreviated translation of a M.Sc thesis work about fuzzy control that was carried out by the second author (A.S.) under the supervision of the first author (K.F.) during the fall of 1992. The complete report (in Swedish) is [14]. Fuzzy Control is a design method for nonlinear controllers, which is becoming more and more common in industrial applications. However, a major disadvantage of fuzzy control, is that the controllers obtained are often difficult to analyze mathematically. Instead, much of the analysis so far has been made through simulation. In the thesis work a Maple software tool was developed, with which you could easily design and analyze fuzzy controllers. The tool makes it possible determine the closed expression for fuzzy control laws. It is then possible to analyze the closed loop system by standard methods from non-linear control theory (for example the circle criterion). It also has functions for translating the controller description to a MATLAB function (m-file), for example to be used in the MATLAB simulation environment, Simulink.FuzzyCAT is available by anonymous ftp at the address 130.236.24.1 (or equivalently joakim.isy.liu.se), contained in the file /pup/src/maple/FuzzyCAT/fuzzycat