PT. Selamat Sempurna is repetitive flow shop manufacturer has a make to order business. It produces otomotive filter as a main product. The problerm which face of by PT. Selamat Sempurna are the SPCD’s Invenventory that not been arranged, which cause by the customer demands are not constantly, and inventory order specially SPCD until received (lead time are constant) are 3 month, meanwhile t…