Abstract: An expert systemt hat incorporates with fuzzy logic is implemented to monitor inreal time the close loopper formance of a multiv ariable process. The expert system adjusts the filter time constants to improve the performance of close loop. If the performance,measured on the integral squar eerror,exceeds acerta invalue the expert system suggests areidentification of the process. The simulation shows anoticeable improvement in the performance of the close loop when using the expert system.