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Why Cost Performance Index is considered as most critical in EVM while we say Time is Money?

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Shahab Khan PM Consultant| Qatar Project Management (QPM) Doha, Qatar
Why Cost Performance Index is considered as most critical in EVM while we say Time is Money?
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Stéphane Parent Self Employed / Semi-retired| Leader Maker Prince Edward Island, Canada
The CPI is built upon the earned value, which is usually estimated, and the actual costs, which are real.

On the other hand the SPI is based on the earned value and the scheduled value, also estimated.

The CPI is more representative because only half of the values compared are estimated. For the SPI both compared values are estimated.

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