Task Effort Driven Vs Non-Effort Driven – MS Project Tips

99 Tips and traps for microsoft project - ebookMS Project Tips and Tricks – Effort driven or Non Effort driven?

The Task Effort is the sum of the Work (hours) of all Work Type resources assigned to a task.

The Effort driven option determines how the effort is calculated as resources are added or removed from a Fixed Units or Fixed Duration task.

There are two options in MS Project:

Effort driven When a resource is added or removed from a task, the Task Effort assigned to a task remains constant. Therefore the Work of existing Resources is reduced when a new resource is assigned. Adding or removing resources from a task will leave the total effort assigned to a task constant, unless all resources are removed or a change is made to the work of existing resource assignments.
Non Effort driven When a resource is added to or removed from a task, the Resource Effort or Work of other resources remains constant. Adding or deleting resources increases or decreases the total task effort and will not change the effort of assigned recourses.

In summary, as you assign resources:

– If you want the total number of hours assigned to stay constant then make the Task Effort driven.

– If you wish to assign each resource with its own hours or units per time period then make the task Non Effort driven.

Note: A Fixed Work task is automatically Effort driven.

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