A master schedule of items to be produced and their due dates are entered into the computer, which then accesses the bill of materials, materials delivery lead times, and quantities of inventory on hand and on order. The computer program calculates the needed quantity for each material and the amount and timing of demands on each work location. These demands, when compared with machine and personnel capเciii’es, determine the feasibility of meeting the master schedule. If work overloads cannot be resolved, the master schedule must be revised