Set Task Type

​​​Available task type

     Fixed units
     Fixed duration
     Fixed work

Task types apply only to automatically-scheduled tasks, and come in three flavours: fixed units, fixed work, and fixed duration. Project looks at a task's type to determine how duration, work, and units will behave as Project schedules your project.

Each of the task types affects scheduling when you edit one of the three elements as follows.

In a
If you revise units If you revise duration If you revise work
Fixed units taskDuration is recalculated.Work is recalculated.Duration is recalculated.
Fixed work taskDuration is recalculated.Units are recalculated.Duration is recalculated.
Fixed duration taskWork is recalculated.Work is recalculated.Units are recalculated.


To change a task type, double click the task name in the Gantt Chart, then click the Advanced tab.

Some examples

Let's say you have a fixed-units task, with 1 full-time resource unit available for 8 hours each day. You set the task up with a 10-day duration and 80 hours of work.

If you find out that another full-time resource can assist on the task, Project recalculates the task's duration. The task now has two units assigned, with a 5-day duration and 80 hours of work.

If you find out that you have 8 days to complete the task rather than 10, Project recalculates the task's work. The task now has an 8-day duration, with 64 hours of work and 1 resource unit.

If you find out that the task will take 20 hours of additional work, Project recalculates the task's duration. The task now has 100 hours of work, with a duration of 12.5 days and 1 resource unit.

Now let's say you make the same task a fixed-work task. This means that the task can take only the amount of work that you specify: no more, no less. In this example, the task has 1 full-time resource available for 8 hours each day, and it has a 10-day duration with 80 hours of work.

If you find out that another full-time resource can assist on the task, Project recalculates the task's duration. The task now has 2 units assigned, with a 5-day duration and 80 hours of work.

If you find out that you have 8 days to complete the task rather than 10, Project recalculates the task's resource units. In order to get the task done in 80 hours over 8 days, 1.25 resource units must be assigned. The resource unit that is currently assigned to the task is allocated at 125%. You need to assign another resource to account for the additional 25% allocation.

If you find out that the task will take 20 hours of additional work, Project recalculates the task's duration. The task now has 100 hours of work, with a duration of 12.5 days and 1 resource unit.

Finally, let's say you make the same task a fixed-duration task. This means that the task must be completed in the duration that you specify. Again, in this example, the task has 1 full-time resource available for 8 hours each day, and it has a 10-day duration with 80 hours of work.

If you find out that another resource can assist on the task, Project recalculates the work assigned to each resource. When just 1 resource was assigned to the task, that resource had 80 hours of work to complete. When you assign another resource to the task, each resource has 40 hours of work to complete over the same 10-day duration, for a total of 80 hours of work. By adding another resource unit, you also revise the allocation of both units to 50% each, making them both available to work 50% on other tasks.

If you find out that you have 8 days to complete the task rather than 10, Project recalculates the task's work. The task now has an 8-day duration, with 64 hours of work and 1 resource unit.

If you find out that the task will take 20 hours of additional work, Project recalculates the task's resource units, so that the additional work can still be completed within the 10-day duration. The task now has 100 hours of work, with a duration of 10 days and 1.25 resource units. The resource unit that is currently assigned to the task is allocated at 125%. You need to assign another resource to account for the additional 25% allocation.​

Here's a table of things to keep in mind about task types.

Tips and GotchasExplanation
Add a column to help you change task typeYou can view and change the task type for each task directly in your view by inserting the Type field. Click the column to the right of where you want to insert the new column, click the Insert menu, and then click Column. In the Field name list, click Type.
Summary tasks are always fixed-duration tasks Summary tasks are always fixed-duration types because a summary task's start and finish dates are determined by its subtasks.
Use indenting to outline, not task types If you want to change the hierarchical structure of a task or subtask as part of an outline structure for your project, you need to indent or outdent the task rather than change the task type or add a deadline date.
Don't' confuse task constraints, like ASAP, with task typesIf you want to impose restrictions on the way Project calculates the start and finish dates of tasks, you need to set a task constraint, rather than the task type.

 

Applies to version 2015 and higher.
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