How do the three % Complete Calculation Methods Work

Document ID : KB000125361
Last Modified Date : 28/01/2019
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Question:
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. 
Answer:
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
Note: When switching from Manual to Effort you letting Clarity decide on Task status and if it does not see any Actuals it will reset status to "Not Started". When the % Complete Calculation Method is changed from Manual to Duration, the % Complete and Status on any summary level task will update to reflect the progress of its subtasks.