A novel delivery management system using a new lot sampling scheduling (LSS) method has been developed. The method involves the concepts of "virtual line" and "marker lot," and the system consists of an on-line scheduler executing short-period scheduling for lot-tracking and an off-line scheduler executing long-period scheduling for delivery date simulation. The LSS method can hugely increase the maximum number of lots to simulate the delivery date and also control TAT more effectively compared to conventional dynamic scheduling. Lot progress is controlled by varying the resource allocation ratio for each virtual line. This method is effective for precise delivery date control of lots with various priorities in ASIC production or development lines.