它们互相联系、互相作用和互相制约，是一个和谐的统一体。
The two processes, which are mutually associated, interactive and restrictive, are considered as an integrated system.
图3 - 11形象地说明了过程组如何互相联系和作用，也表示了在各个不同时间互相重叠的水平。
Figure 3-11 illustrates how the Process Groups interact and the level of overlap at varying times within a project.
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