Project Management Process Groups are linked by the outputs they produce. The Process Groups are seldom either discrete or one-time events; they are overlapping activities that occur throughout the project. The output of one process generally becomes an input to another process or is a deliverable of the project. The Planning Process Group provides the Executing Process Group with the project management plan and project documents, and, as the project progresses, it often entails updates to the project management plan and the project documents. Figure 3-2 illustrates how the Process Groups interact and shows the level of overlap at various times. If the project is divided into phases, the Process Groups interact within each phase.
An example of this would be the exit of a design phase, which requires customer acceptance of the design document. Once it is available, the design document provides the product description for the Planning and Executing Process Groups in one or more subsequent phases. When a project is divided into phases, the
Process Groups are invoked as appropriate to effectively drive the project to completion in a controlled manner.In multi-phase projects, processes are repeated within each phase until the criteria for phase completion have been satisfied.

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