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Effort Driven Duration Type

This article is linked here: https://workfront.zendesk.com/hc/en-us/articles/216607088

Understanding the Effort Driven Duration Type

Effort Driven is a duration type that can be set on a task in Workfront.

If Effort Driven is set as the default duration type in the project preferences of your Workfront system, all new tasks will be created with this duration type. For more information about changing your task and issue preferences as part of your system-level project preferences, see "Task and Issue Preferences."
In this scenario, there is a risk of arbitrarily abbreviating the project plan, unless the you, as the project manager, take the time to consider whether the task is actually an Effort Driven task.

Use Effort Driven to:

  • Determine the Planned Duration based on the number of resources available to work on the task. Duration is equal to Planned Hours. Planned duration is equal to Planned Hours divided by the number of assignees.
    The level of effort applied to the task determines the division of labor and duration.
  • Track the total number of hours spent on a task when multiple resources are assigned.
    As resources are added, the Planned Duration of the task decreases. (The principle of "many hands make light work" illustrates the effect of this duration type.)

The following sections provide more detailed information about how Effort Driven is calculated and the effect that adding resources has to the task when Effort Driven is set as the duration type.

Understanding The Effort Driven Duration Type Formula

Simplified Formula

This formula assumes that all resources are allocated 100% to the task.

Planned Hours = Duration (in hours)
Planned Duration = (Planned Hours / Number of Resources) / 8
* 8 represents the number of hours in a normal work day. The equation includes this value so the Planned Duration displays in days. Your system administrator defines the hours per workday with the Typical Hours per Work Day setting in the Project Preferences in Setup. For more information about changing your task and issue preferences as part of your system-level project preferences, see "Task and Issue Preferences."

Actual Formula

Because each assigned resource can have a unique level of allocation, the actual formula takes these allocation values into account:

Planned Hours = Duration (in hours)
Planned Duration = (Planned Hours / (Each resources percent allocation for the task)) / 8
* 8 represents the number of hours in a normal work day. The equation includes this value so the Planned Duration displays in days.

Understanding The Effect Of Resources

When adding or removing assignees to a task with the Effort Driven duration type, duration and Planned Hours do not change. However, the Planned Duration does change.

In the following example, the Typical Hours per Work Day is set to 8 in the project preferences in your system setup. Because the duration is 3 days, the Planned Hours is set to 24 (3 days x 8 hours per work day = 24 Planned Hours).

NOTE When using the Fixed Dates task constraint, the Planned Duration remains the same when assignees are added or removed, and instead the duration and Planned Hours are adjusted.

When using any task constraint other than Fixed Dates, the Planned Duration is adjusted as shown in the following table and graphic:

The following table illustrates how the Planned Duration changes with adding resources to the task:

Number of Assignees (each 100% allocated)

Duration

Planned Hours

Planned Duration

1

3 Days

24 Hours

(3 Days x 8 Hours per Work Day = 24 Planned Hours)

3 Days

(24 Planned Hours / 1 Assignee = 3 Days)

2

3 Days

24 Hours

(3 Days x 8 Hours per Work Day = 24 Planned Hours)

1.5 Days

(24 Planned Hours / 2 Assignees = 12 Hours, or 1.5 Days)

3

3 Days

24 Hours

(3 Days x 8 Hours per Work Day = 24 Planned Hours)

1 Day

(24 Planned Hours / 3 Assignees = 8 Hours, or 1 Day)

In the following example, 3 assignees are 100% allocated to the Effort Driven task:

Changing The Duration Type Of A Task To Effort Driven

  1. In the task list, click the name of the task for which you want to change the duration type.
  2. On the Task Details tab, ensure that Overview is selected, then click Edit Overview.
  3. In the Duration Type drop-down field, select Effort Driven.
  4. Click Save.