A cable manufacturer must contend with scheduling many processes with intermediate items and varying process routes. From wire drawing to twisting, cabling, and testing, processes need to be scheduled with close regard to order priority, overlap, cable type, and specific-skill worker availability. All resources running these processes have their own specific restrictions, and optimizing by looking at only one resource, line, or order process can negatively impact all the others.
The many restrictions of cable manufacturers make scheduling a huge challenge. Semi-finished inventory is a problem, and accurately forecasting when you need raw material delivered can be hopeless, especially with frequent changes, rush orders, or changing priorities.