Middle+ — Senior
What is the Schedule Performance Index (SPI)?
sobes.tech AI
Answer from AI
Schedule Performance Index (SPI) is a measure of project schedule efficiency. It indicates how the actual progress compares to the planned progress at a given point in time.
Formula:
SPI = Earned Value (EV) / Planned Value (PV)
- EV (Earned Value) — the cost of work actually performed to date.
- PV (Planned Value) — the budgeted cost of work scheduled to be performed to date.
If SPI = 1, the project is on schedule. If SPI < 1, the project is behind schedule. If SPI > 1, the project is ahead of schedule.
Example: if 50% of the project time has passed and 40% of the work cost has been completed, then SPI = 0.8 — meaning the project is behind schedule.