CAPM Practice: Demonstrate an understanding of a project management plan schedule

The SPI can be used to forecast whether the project will finish on time. If SPI = 0.80, the project is performing at 80% schedule efficiency. Applying this to remaining work suggests it will take more calendar time than originally planned. For example: if 6 months remain planned, at SPI=0.80, it may take 6/0.80 = 7.5 months — forecasting a 1.5-month overrun.

**Why not A:** The Cost Performance Index (CPI) measures cost efficiency (EV/AC), not schedule performance. While CPI is valuable for forecasting cost overruns, it does not predict whether the project will finish on time — that requires the schedule-focused SPI metric.

**Why not B:** Schedule Variance (SV = EV - PV) shows the current difference between earned and planned value, indicating whether the project is ahead or behind at a point in time. However, SV alone does not forecast future completion — SPI provides the efficiency rate needed to project remaining duration.

**Why not C:** Comparing BAC to current spend compares the total budget to money spent, which is a crude cost measure that tells nothing about schedule performance. It does not account for the value of work actually completed and cannot predict whether the project will finish on time.