Project: Actual Work in Task Table May Change Unexpectedly
PSS ID Number: Q111280 Article last modified on 10-14-1994
3.00 3.00a
WINDOWS
| The information in this article applies to: |
| - Microsoft Project for Windows, versions 3.0, 3.0a - Microsoft Project for Macintosh, version 3.0 |
SYMPTOMS
When you enter actual work in a task table, Microsoft Project may change the entered value.
CAUSE
This behavior occurs as a result of the way Microsoft Project calculates actual work on a task table when resources are assigned.
Microsoft Project calculates actual work with the following formula:
Actual Work = (Task Work/Sum(All Resource Units))xResource Units
MORE INFORMATION
Steps to Reproduce Behavior
- Use a dual-pane view with a task sheet on top, and a task form on the bottom.
- With the task sheet active, choose Work from the Table menu.
- Enter a task with a duration of 8h, and assign 1 unit of a resource to the task.
- Change the resource units to .86.
The Duration should now be 1.16d, and work should be 8h.
- On the task sheet, enter 8h in the Actual Work field.
The actual work will be recalculated to 7.98h.
Explanation
Microsoft Project calculates actual work with the following formula:
Actual Work = (Task Work/Sum(All Resource Units))xResource Units (in this case Actual Work=(8h/.86)x.86)
Because Microsoft Project stores 8h as 480 minutes, 480/.86 = 558.1395. Microsoft Project rounds the 558.1395 to 558 x .86=479.88, which is then rounded to 479. Microsoft Project then converts this value back to hours as 479/60 = 7.9833, which is rounded to 7.98.
KBCategory: kbusage KBSubcategory:
Additional reference words: 3.00 3.00a
Copyright Microsoft Corporation 1994.
