How do the three % Complete Calculation Methods Work?
The way the % Complete field is calculated depends on the % Complete Calculation Method selected for that project.
Manual: If this option is selected, the value in the % Complete fields are manually entered at all levels in the task breakdown structure. Entering a % Complete value for a task does not affect any other tasks in the hierarchy.
Once the task level % Complete values are manually updated, the % Complete field at project level must also be manually updated.
By default, the % Complete field at project level is located at the Project Properties > Schedule & Performance sub-page
Duration: This method measures the passage of time. If this option is selected, you can manually enter percent complete at the detail task level. However, the summary task and project level percent complete will be read only and will calculate based on the percentage of completed duration of all the detail tasks.
% Complete = Completed Duration / Total Duration
Effort: This method will calculate the percent complete for all tasks. The % Complete on all summary and detail tasks will be read only. When using this method, only work done by labor resources is considered. (All non labor actuals and ETC will be ignored.)
The percent complete will be calculated based on the following formula:
% Complete = Labor Actuals/( Labor Estimates + Labor Actuals)
The % Complete calculation at the summary task or project level (for projects using the Effort or Duration calculation methods) is triggered by the "Update % Complete" job