Did this ever get resolved? I had the same question when we were discussing Earned value for Partially Completed activities in our local prep-class.
video 7.05.01 Earned Value Analysis at time 12:10 when defining EV:
“The operative word is performed in other words completed, not partially completed, but completed in full. If we are 75% done with a task that is planned to take 1000$ complete we have earned $0, not $750."
This is contradictory to lessons from Ritas Ninth Edition page 300.
Until you respond

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Nate J