In Earned Value Project Management Method and Extensions, Anbari states that, in a project, “the schedule variance (SV) is a measure of the conformance of actual progress to the schedule: SV = EV – PV” (Anbari, 2003). Read more about the SPI at the link below:
If someone asked how much value you get from a day of work, what would you say? Odds are, you’d give one of the customary responses — a fair amount of value, not much value, a lot of value, etc. Unfortunately, these answers aren’t helpful and aren’t valuable to projects.
The schedule performance index was created to eliminate the guesswork and give a specific, quantifiable answer to the question, as well as show where improvements need to be made for maximum efficiency.
What Is the Schedule Performance Index?
Schedule performance index (SPI) is part of a greater project performance measurement method called earned value management (EVM). The SPI itself is a ratio of earned value to planned (or actual) value. Depending on the integer, SPI reflects a project being on schedule, behind schedule or ahead of schedule.
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Anbari, F. T. (2003). Earned value project management method and extensions. Project Management Journal, 34(4), 12–23
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