The maximum relative error is about 1% after 3 time iterated process, and it is less than 0.012% after 4 time iterated process and it is almost equal to zero after 5 time iterated process.

经过3次迭代之后，最大的相对误差约为1％； 经过4次迭代之后，相对误差减少两个数量级，小于0．012％； 经过5次迭代之后，误差几乎为零。

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Among the processes in the Project Management process Groups, the links are often iterated.

在各项目管理过程组的子过程之间，经常反复多次产生联系。

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Then the process is iterated when a need is generated in the implementation process.

然后，这个过程是迭代时，需要在实施过程中产生的。

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