I had a recent question concerning an apparent difference between the % complete showing on the Project Center view for a task/project and the % complete showing on My Tasks. If you have more than one assignment and many tasks it can be difficult to reconcile the task status to the overall project. But in this case the customer had one task, one assignment so why the difference? If the project proceeds to plan then there wouldn't be a difference, but if the work performed is different from plan then you can see different values here. The reason is that the Project Center is showing % Complete - which is based on duration, and My Tasks is showing % Work Complete, which is based on work.
An example will help. Assume a 10 day task with 8 hours work per day - 80 hours. If at the end of the first day the resource has completed 8 hours work then both % complete and % work complete are 10% (1 day out of 10 for duration and 8 hours work out of 80 for work). If however the resource only completes 7.5 hours of work we see a difference. Project will assume that this is all the work being carried out on day 1 so will need to extend the duration by half an hour (0.0625 days). So the % complete is now 1 day out of 10.06 days (9.94% - displayed as 10% in Project Center) and the % work complete is 7.5 hours out of 80 hours (9.375% - displayed as 9% in My Tasks).
You can of course always add the % work complete field to a project center view if you want to see this figure.
The other % complete column, Physical % Complete, can be manually entered at the task level and can be used to drive the earned value calculations. This is used when the other values may not accurately reflect the real progress made in completing the task.
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