模块化的结果就是设计简化、易于理解、质量提升、开发时间降低以及对系统需求变更的快速响应。

The result of such modular implementation is simplified design, improved understandability, improved quality, reduced time to market, and expedited response to system requirement changes.

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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。

These five models can be used not only for initial design, but also when requirements change throughout the system lifecycle.

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例如，对于一个新系统项目而言，你在GDD环境中所选择的管理需求变更的方法，与关联于第三方的遗留维护合同的管理需求变更方的法将有很大的不同。

For example, the way you choose to manage change to requirements in a GDD environment could differ greatly for a new system project compared to a legacy maintenance contract involving a third party.

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