THIS PAPER PRESENTS AN INTEGRATED APPROACH FOR THE DESIGN OF MANUFACTURING SYSTEMS. THE WORK OUTLINED HERE FOCUSES ON DEVELOPING AN INTEGRATED APPROACH USING GENETIC ALGORITHMS FOR IMPLEMENTING A PROPOSED DESIGN METHODOLOGY FOR EVOLVING THE STRUCTURAL SPECIFICATIONS OF A MANUFACTURING SYSTEM. STARTING WITH A SYSTEM REQUIREMENT ANALYSIS THE APPROACH TAKES INTO CONSIDERATION, UNCERTAINTY IN PRODUCT DEMAND, AND SYSTEM FLEXIBILITY WHILE DESIGNING THE MANUFACTURING SYSTEM.