The Schedule Performance Index (SPI) is a key performance metric used in project management to assess the efficiency of time utilization on a project. It is calculated by dividing the Earned Value (EV) by the Planned Value (PV), giving insights into whether a project is ahead, behind, or on schedule. A SPI value greater than 1 indicates the project is ahead of schedule, while a value less than 1 signals it is behind schedule.
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