本政策处理了后代流中有什么是不同的，以及它与起始之间将会维持多长时间的差异性。
This policy addresses the concerns about what in a descendant stream may be different, and how long it may remain different from its ancestor.
什么时候每一个项目必须遵循企业模型，以及项目与企业保持差异性可以维持多长时间，这也是一个政策决定。
It is also a policy decision as to when each project must conform to the enterprise models and for how long a project may remain at variance to the enterprise.
另一项重点是政策加强和报告，例如每一个项目能与企业模型保持多久的差异性。
Also important are policy enforcement and reporting, for example how long each project has been at variance with the enterprise models.
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