IEEE Std 1220-1998: "A set or arrangement of elements and processes that are related and whose behavior satisfies customer/operational needs and provides for life cycle sustainment of the products."
」 IEEE Std 1220-1998：「一整套、或相關布局的元素和流程，其特性以满足客户/運作的需要，并提供产品生命周期的支持。