Article ID: 101495 - View products that this article applies to.
This article was previously published under Q101495
Microsoft Project calculates the Summary Level Percent Complete value based on its immediate subordinate tasks (summary and detail tasks). This method of calculation can cause the percent complete for a higher-level summary task to differ from a calculation done by hand if only the detail tasks and not the subordinate Summary tasks are used.
The Percent Complete for a Summary Task is a weighted average of its immediate subordinates.
In order for Microsoft Project to speed up calculations, the percent complete of a summary task is based on its direct subordinate tasks and subordinate summary tasks percent complete (if any).
Project uses the following calculation:
For a summary task, percent complete is first calculated from its immediate subordinates, and then actual duration is determined. For a task, either percent complete or actual duration can be solved.
Percent Complete = Actual Duration / Duration
The following example assumes a default base calendar with no resource assignments:
NOTE: In Microsoft Project 98/2000, the Percent Complete is 20% instead of 23% and Actual Duration is 1.6d instead of 1.8d.
Name Outline Dur Sch St Sch Fin %Comp Act Dur Top Summary 1 8d 1/1/96 1/10/96 23% 1.8d Subordinate Summary 1.1 5d 1/1/96 1/5/96 25% 1.25d task1 1.1.1 1d 1/1/96 1/1/96 50% 0.5d task2 1.1.2 1d 1/5/96 1/5/96 0% 0d task3 1.2 1d 1/10/96 1/10/96 10% 0.1d
Percent Complete of the "Subordinate Summary" is calculated like this:
Percent Complete of the "Top Summary" is calculated like this:
Because the duration of the "Subordinate Summary" does not equal the duration of its subordinate tasks, the percent complete of the "Top Summary" task does not reflect the percent complete values of the tasks themselves.
If the Percent Complete of the "Top Summary" was based on only the subordinate tasks, and not the "Subordinate Summary," it would be calculated as follows:
Article ID: 101495 - Last Review: January 18, 2007 - Revision: 3.1