如果您在刚开始时就知道系统需要做什么以及它需要如何做，您就可以预先进行大部分(如果不是全部)的设计工作。

If you know at the beginning what the system needs to do and how it needs to do it, you can do most (if not all) your design up front.

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研究IBM电子商务模式，它预先建立了用于创建和实现大型集成系统的设计。

Explore IBM Patterns for e-business, prebuilt designs for creating and implementing large integrated systems.

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系统的核心设计是预先完成的，但是具体实现还是在开发过程中慢慢成型。

The major design of the system was known up front, but the implementation was still a work-in-progress during the construction of the software.

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