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Modern manufacturing facilities include conventional work centres as well as flexible manufacturing systems (FMSs). Discusses computer simulation software which simulates and graphically animates in real time an integrated job shop/FMS. The program interfaces a FORTRAN‐based simulator with a mainframe computer aided design (CAD) system which provides for 3‐D wire‐frame computer graphics and real‐time animation. The program also employs a batch‐oriented material requirements planning (MRP) system to provide daily updates of outstanding production centre loadings on a monthly planning horizon. Presents an example of an evaluation of an actual manufacturing facility.