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How does SPI work after the planned completion date is passed?

After the planned completion date is passed, SPI converges on 1.0 even though a project is still behind schedule. Is there a variation in the calculation to account for this? For example, if a 6 week project takes 12 weeks to complete, the SPI ends up at 1.0 when the project is completed even though the actual performance against schedule is 0.5. Am I missing something, or is this the way the calculation is supposed to work? It seems to result in inaccurate reporting once you pass the end date for a task or project.
asked 8 years ago by anonymous

1 Answer

SPI is the ratio of earned value to planned value.  So it can be greater than 1 or less than 1.  Above 1 indicates the team is efficiently performing.  Below 1 means they are not.  It can get further and further below 1 if the team performs poorly or you lose all your resources for a period.
answered 8 years ago by sdcapmp (45,840 points)

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