In the normal fuzzy logic control (FLC) system, both the membership functio
ns and the rule sets are usually decided upon subjectively, case by case. T
he application of Genetic Algorithm(GA) could lead to proper selection of m
embership functions and rule base objectively. In this paper, the optimisat
ion of membership functions of a FLC for a fed-batch fermenter is carried o
ut with help of Genetic Algorithm (GA). Results are found to be satisfactor
y.