ISEB-PM1 · Question #348
Using the following data, what is the Schedule Performance Index (SPI)? EV = $500 PV= $750 AC= $1000 BAC= $1200
The correct answer is A. 0.67. SPI = EV ÷ PV, so $500 ÷ $750 = 0.67, confirming option A. An SPI below 1.0 means the project is behind schedule - you've earned less value than planned. Why the distractors are wrong: B (1.50) inverts the formula - it divides PV by EV ($750 ÷ $500), which reverses the…
Question
Using the following data, what is the Schedule Performance Index (SPI)? EV = $500 PV= $750 AC= $1000 BAC= $1200
Options
- A0.67
- B1.50
- C0.75
- D0.50
How the community answered
(32 responses)- A81% (26)
- B3% (1)
- C13% (4)
- D3% (1)
Explanation
SPI = EV ÷ PV, so $500 ÷ $750 = 0.67, confirming option A. An SPI below 1.0 means the project is behind schedule - you've earned less value than planned.
Why the distractors are wrong:
- B (1.50) inverts the formula - it divides PV by EV ($750 ÷ $500), which reverses the relationship and has no standard meaning.
- C (0.75) comes from dividing PV by AC ($750 ÷ $1,000), mixing up the wrong variables entirely.
- D (0.50) is actually the CPI (Cost Performance Index = EV ÷ AC = $500 ÷ $1,000) - a common trap that tests whether you can distinguish schedule from cost performance.
Memory tip: Think "SPI = Schedule = PV in the denominator" - PV is your planned (scheduled) baseline, so it anchors the schedule index. If you remember CPI = EV/AC (both "actuals"), then SPI = EV/PV follows naturally as the other pair.
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