SPI & CPI

Schedule Performance Index(SPI) = EV/PV
greater than 1 is good (ahead of schedule)

Schedule Variance (SV) = EV-PV greater than 0 is good (ahead of schedule)
Schedule Performance Index (SPI)


Cost Variance (CV) = EV - AC
greater than 0 is good (under budget)

Cost Performance Index (CPI) = EV/AC
greater than 1 is good (under budget)
< 1 means that the cost of completing the work is higher than planned (bad)
= 1 means that the cost of completing the work is right on plan (good)
> 1 means that the cost of completing the work is less than planned (good or sometimes bad).