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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项目采购管理包括合同管理和变更控制过程，它们是管理由授权的项目团队成员签发的合同或采购订单所必需的。

Project Procurement Management includes the contract management and change control processes required to administer contracts or purchase orders issued by authorized project team members.

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工程变更是指由于设计文件或技术规范修改而引起的合同变更，它对工程造价管理工作有较大的影响。

The change of project refers the changes of contract caused by the modification of design document or technical specifications, which has great impact on the work of project cost management.

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