The duration of a task changed when I assigned a resource


When you assign resources (resources: The people, equipment, and material that are used to complete tasks in a project.) to a task (task: An activity that has a beginning and an end. Project plans are made up of tasks.), Microsoft Office Project 2007 calculates how long the task is likely to take to complete using those resources. If you assign multiple resources at the same time, the duration (duration: The total span of active working time that is required to complete a task. This is generally the amount of working time from the start to finish of a task, as defined by the project and resource calendar.) doesn't change from your original estimate. But if you assign additional resources to a task that already has an assignment (assignment: A specific resource that is assigned to a particular task.), Office Project 2007 calculates how much less time it will take with these additional resources. This is known as effort-driven scheduling (effort-driven scheduling: The default method of scheduling in Project; the duration of a task shortens or lengthens as resources are added or removed from a task, while the amount of effort necessary to complete a task remains unchanged.).

For example, if a task with a four-day duration is assigned to two resources, the duration stays at four days, and each resource is assigned to work on the task for four days. However, if you assign two additional resources, the duration decreases to two days because the duration is expected to be half as long with twice as many resources.


Reset the duration to its previous value

  1. Select the task that you want to change.
  2. Click Assign Resources Button image.
  3. In the Resource Name column, select the resource that you added to the originally assigned resources, and then click Remove.

Turn off effort-driven scheduling for an individual task

  1. Select the task that you want to change.
  2. Click Task Information Button image, and then click the Advanced tab.
  3. Clear the Effort driven check box.

Turn off effort-driven scheduling for all new tasks

  1. On the Tools menu, click Options.
  2. Click the Schedule tab.
  3. Clear the New tasks are effort driven check box.
Applies to:
Project 2007