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Schedule Performance Index (SPI)

An indicator of schedule efficiency calculated by dividing earned value (EV) by planned value (PV).

Key Points

  • Formula: SPI = EV / PV; it compares authorized work accomplished to the work that was planned by this point.
  • Interpretation: SPI > 1.0 means ahead of schedule, SPI = 1.0 means on schedule, SPI < 1.0 means behind schedule.
  • Use only when PV > 0 and when EV and PV are measured against the same baseline; track SPI trends to monitor schedule health and forecast performance.
  • SPI shows relative schedule progress, not calendar time impact; combine with critical path analysis and CPI for a fuller picture.

Example

By the end of month 3, PV is 150 units of work and EV is 120 units. SPI = 120 / 150 = 0.80. The team is progressing at 80 percent of the planned rate, indicating the project is behind schedule.

PMP Example Question

A project reports EV = 275 and PV = 250 near the end of a phase. What is the SPI and how should the project manager interpret it?

  1. 0.91; the project is behind schedule
  2. 1.10; the project is ahead of schedule
  3. 1.00; the project is on schedule
  4. 1.10; the project is over budget

Correct Answer: B — SPI of 1.10; the project is ahead of schedule

Explanation: SPI = EV / PV = 275 / 250 = 1.10. An SPI greater than 1 indicates the project is ahead of schedule; cost status is not assessed by SPI.

Advanced Project Management — Measuring Project Performance

Move beyond guesswork and status reporting. This course helps you measure real progress, spot problems early, and make confident decisions using proven project performance techniques. If you manage complex projects and want clearer visibility and control, this course is built for you.

This is not abstract theory. You’ll work step by step through Earned Value Management (EVM), learning how cost, schedule, and scope come together to show true performance. You’ll build a solid foundation in EVM concepts, understand why formulas work, and learn how performance data actually supports leadership decisions.

You’ll master Work Breakdown Structures (WBS), control accounts, and budget baselines, then apply core EVM metrics like EAC, TCPI, and variance analysis. Through a detailed real-world example, you’ll forecast outcomes, analyze trends, and understand contingencies and management reserves with confidence.

Learn how experienced project managers monitor performance, communicate results clearly, and take corrective action before projects slip. With practical exercises and hands-on analysis, you’ll be ready to apply EVM immediately. Enroll now and start managing performance with clarity and control.



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