Forum Discussion
aneeshU1
Jan 27, 2023Copper Contributor
Project summary actual duration or % complete lower than those of the sub tasks
I have been tracking this schedule for a while. Just noticed that the % complete or the actual duration of the Project summary task is lower than those of the sub tasks. Why is this weird behavior ? ...
John-project
Jan 28, 2023Silver Contributor
aneeshU1,
Rest assured, it is not weird behavior and you didn't make any mistake. In Project the Percent Complete for a summary line is calculated as:
(sum of all subtask actual durations)/(sum of all subtask durations) * 100%
Apply the above to any summary line, including the Project Summary Task and you should see the value shown.
Hope this helps.
John
Rest assured, it is not weird behavior and you didn't make any mistake. In Project the Percent Complete for a summary line is calculated as:
(sum of all subtask actual durations)/(sum of all subtask durations) * 100%
Apply the above to any summary line, including the Project Summary Task and you should see the value shown.
Hope this helps.
John
- aneeshU1Jan 28, 2023Copper Contributor
John-project But why the actual duration of the Project summary task is lower than the actual duration of the sub-summary tasks. For ex., mobilkization is 793 days.. milestone is 939 days.. but Project actual duration is only showing 559. It's weird.
- John-projectJan 28, 2023Silver Contributor
aneeshU1 You say it's weird. So what do you think the actual duration of the Project Summary task should be?
Keep in mind that summary lines are NOT tasks, despite with the literature may call them, t hey are simply a summary of data for performance tasks (subtasks that have resources assigned to do something). As such percent complete and actual duration for summary lines will be some form of weighted average for all the subtasks under them. The developers of Project chose the formula I showed as that weighted average.
Here's a simple example. Should the actual duration of the Project Summary task be longer than any of the summary tasks under it just because it's the Project Summary task? Answer, "no".
Hope I clarified it for you.
John