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Chapter 9. Understanding Resource Schedu... > Understanding the Driver Resource Co...

Understanding the Driver Resource Concept

The various changes in assignments described so far in this chapter produce changes in assignments and in the task duration. It helps to understand the changes in assignments if you understand the concept of the driver resource.

The term driver resource is used to identify resources whose assignments determine the duration or finish date for the task. Recall that when there are multiple resources assigned to a task, the task duration is at least as long as the longest assignment. The resources with the longest assignments are the driver resources. Other resources whose assignments finish earlier are nondriver resources. Anything that causes a driver resource’s assignment to finish later causes the task to finish later. Thus, increasing the workload for a driver resource typically increases the task duration; but increasing the workload for a nondriver resource (at least up to a point) does not affect task duration.


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