In an agile iteration the team planned 40 story points but completed 30. What is the schedule performance index (SPI)?
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Correct answer: 30/40.
Why this is the answer
The Schedule Performance Index (SPI) in an agile context compares the work completed to the work planned. It is calculated as Earned Value (EV) / Planned Value (PV). In this scenario, the "earned value" is the work actually completed, which is 30 story points. The "planned value" is the work the team planned to complete, which is 40 story points. Therefore, the SPI is 30/40. An SPI less than 1 (as in this case, 0.75) indicates that less work was completed than planned, meaning the project is behind schedule. The other options are incorrect because they do not follow the standard SPI formula: 30/70 incorrectly sums planned and completed work. 40/30 inverts the formula, which would imply being ahead of schedule. 40/70 incorrectly sums planned and completed work and inverts the ratio.
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