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Author: Elyse, PMP, CPHIMS
January 20, 2005


Schedule Performance Index (SPI) is the ratio of work accomplished versus the work planned. The formula is SPI = BCWP/BCWS.

Schedule Variance, is the measured difference between the planned or scheduled activity duration and the actual activity duration. It is the difference between the Budgeted Cost of Work Performed (BCWP) and the Budgeted Cost of Work Scheduled(BCWS). The formula is SV = BCWP-BCWS. A positive SV indicates that a task is ahead of schedule and a negative SV shows that a task is behind schedule.

In MS project, Select the Gantt Tracking, then View -> Table -> Variance.

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1 Comments to “SPI and SV Components”

An up to date baseline is critical to make MS Project function appropriately for SPI and SV% calculations. If you have any challenges with SPI or earned valued in general with MS Project, select all of the tasks, and update the baseline. It should solve any issues (aside from being late!)


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