A company produces hospital beds for global market with tight delivery schedules. On the production line is often constrained by the uncertainty of inventory and work in process (WIP) availability and has been used excessive resource which is losing company competitiveness. To achieve on time delivery (OTD) applied D Minus 1 production scenario with process sequences are welding, painting and assembly scheduled respectively on D-2, D-1 and D0 day. D minus 1 is activity to provide the WIP buffer downstream as a supply of materials for the upstream process which is carried out periodically with a one-day cycle so that the demand for product delivery can be completed. This scenario modelled as dynamic system which is set as cyclic process with period one day until shipping time. Use production dynamic factors can be simulated production control which is able to achieve OTD. Those factors are function of inventory adjustment time (IAT), Finish inventory adjustment time (FAT) and WIP adjustment time (WAT).Using those factors in the production line can be shown effect of the IAT, FAT, WAT to the level of accurate and precision of the process to the production target, which is can be used for achieve OTD succeed.

D minus 1, hospital beds, system dynamic, on time delivery, inventory adjustment time.