In order to do these exercises efficiently, and to help the overall project, use some sort of system to contain and manage the requirements.

为了有效地进行这些演练并改进整个项目，可以使用某个系统包含并管理需求。

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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.

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。

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The project management system is the set of tools, techniques, methodologies, resources, and procedures used to manage a project.

项目管理系统是由管理项目用的工具、技术、方法系、资源和程序组成的整体。

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