According to the integration requirement of design and manufacturing, this paper discusses the existent problems of geometric modelling, in present CAD systems and the necessity of product modelling.

根据对产品设计与制造集成化的要求，分析了现有CAD系统中几何建模存在的问题及阐述了产品建模的必要性。

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And for a custom integration, user can associate any record type with any requirement type.

对于一个通用的集成，用户可以将任意的记录类型与需求类型联系起来。

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Now, with this integration, working on the correct version of the requirement is no longer hit or miss.

现在，将集成用于正确的需求版本已经不再是漫无目的的了。

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