Which statement about Schedule Performance Index (SPI) is correct?

Which statement about Schedule Performance Index (SPI) is correct?

• A. SPI > 1 means ahead of schedule
• B. SPI < 1 means on schedule
• C. SPI = 0 means complete
• D. SPI cannot measure schedule

Answer: (A)

The Schedule Performance Index (SPI) compares earned value to planned value to gauge schedule efficiency. SPI = EV / PV. When SPI is greater than 1, more work has been completed than was planned for the given time, so you’re ahead of schedule. If SPI is less than 1 you’re behind schedule, and SPI equals 1 means you’re on schedule. Therefore, the statement that SPI > 1 means ahead of schedule is correct. The other options misinterpret the metric: SPI < 1 means behind schedule, SPI = 0 does not indicate completion, and SPI can measure schedule performance.

The Schedule Performance Index (SPI) compares earned value to planned value to gauge schedule efficiency. SPI = EV / PV. When SPI is greater than 1, more work has been completed than was planned for the given time, so you’re ahead of schedule. If SPI is less than 1 you’re behind schedule, and SPI equals 1 means you’re on schedule. Therefore, the statement that SPI > 1 means ahead of schedule is correct. The other options misinterpret the metric: SPI < 1 means behind schedule, SPI = 0 does not indicate completion, and SPI can measure schedule performance.