What is the purpose of the Schedule Performance Index (SPI)?

The Schedule Performance Index (SPI) is specifically designed to assess the efficiency of time used on a project. It measures how effectively a project is progressing compared to its planned schedule. The SPI is calculated by dividing the earned value of the work completed by the planned value of the work scheduled.

An SPI value greater than 1 indicates that a project is ahead of schedule, while a value less than 1 signifies that it is behind schedule. This metric helps project managers make informed decisions about resource allocation, schedule adjustments, and overall project performance with respect to time management.

While other options might relate to project management or performance evaluation, they do not specifically capture the essence of the Schedule Performance Index, which is focused entirely on the timing aspect of project execution.