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S

SPI
SV
SV%
schedule performance index (SPI)
schedule variance (SV)
schedule variance percentage (SV%)

SPI

see schedule performance index.

SV

see schedule variance.

SV%

see schedule variance percentage.

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. $\mi {SPI} = \frac{\mi {EV}}{\mi {PV}}$.

schedule variance (SV)

the difference between the earned value and the planned value of the project at any point in time; that is, $\mi {SV} = \mi {EV} - \mi {PV}$.

schedule variance percentage (SV%)

schedule variance relative to planned value:

\begin{equation*} \mi {SV\% } = \frac{\mi {SV}}{\mi {PV}} \end{equation*}
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