S
SPI
SV
see schedule variance.
SV%
schedule performance index (SPI)
the schedule efficiency ratio of earned value that was accomplished against the planned value. The SPI describes what portion of the planned schedule was actually accomplished. 
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schedule variance (SV)
the difference between the earned value and the planned value of the project at any point in time; that is, 
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schedule variance percentage (SV%)
schedule variance relative to planned value:
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