Project summary actual duration or % complete lower than those of the sub tasks

aneeshU1 

Hello.

The %Complete of a summary task is calculated as previously mentioned:

100 x Sum of all actual subtask durations / Sum of all subtask durations

And your Actual Duration = % Complete x Duration /100

Taking into account that the Duration = Maximum Finish date - Minimum Start date, of all its subtasks, counting in the Project Calendar.

Certainly, the Actual Duration of a summary task is the value of a proportion, which shows an idea of its progress, but which should not be interpreted as elapsed time or real duration.

You can do the checks in the example above. The Duration 1, Duration 2 column displays the sums of the Duration and Actual Duration of the subtasks, respectively.

Regards.