Maintaining a complex repairable system can be achieved by repairing, replacing, or any other activities. This paper proposes a joint optimization policy that is composed with ordering and replacing under minimal repair for the complex system. For this pu

QFD is a system for designing a product or service base on customer demand and involving all members of the producer or supplier organization. In this paper, we will introduce application of QFD as a tool for the mobile phone battery R&D.