PLM systems don't really manage the product's entire lifecycle. It is a front-end oriented system more related to concepts and detailed design.
PLM系统并不是真正用来管理产品完整生命周期的。它是一个定位在前端的系统，跟概念和细节设计关系更大。
Because you are able to model application functionality and help capture requirements with use cases, you are able to design your system more efficiently earlier in its lifecycle.
在用例的帮助下你可以建模应用程序的功能并且获得所需的条件，于是你可以有效设地计系统并且缩短开发周期。
These five models can be used not only for initial design, but also when requirements change throughout the system lifecycle.
这5个模型不仅可以被用在初始设计，对贯穿整个系统生命周期的需求变更亦有裨益。
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