hard · Project Management Professional predictive

Thornfield Labs is overseeing a clinical trial phase that is 90% complete. The project manager notes that while SPI is 0.97, the team is currently 3 months behind the calendar deadline.

Why is SPI(t) the superior metric in this scenario?

  1. It provides a more optimistic view of the schedule to share with stakeholders during the closing phase, before confirming the relevant stakeholders agree.
  2. It remains predictive and valid until the very end of the project, whereas SPI eventually converges to 1.00 regardless of delay.
  3. It automatically adjusts the critical path to account for resource leveling constraints.
  4. It allows the project manager to calculate cost variances without needing the AC curve.

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