Schedule performance index SPI (scheduleperformanceindex) (SPI = EV / PV).

01 indicates that the project implementation lags behind the planned progress. Cost performance index (CPI) (CPI = EV / AC). CPI > 1.0 indicates cost savings, the actual cost is less than the planned cost, and the fund utilization efficiency is high; CPI < 1.0 indicates cost overrun, actual cost is more than planned cost, and fund utilization efficiency is low.