Schedule Performance Index of .80 means the project is behind schedule. The closer to “1” the SPI is the better the project. 2 is incorrect. An SPI of .80 means the project is behind schedule, not ahead. 3 is incorrect. While the project likely will result in being over budget due to the labor demands to complete the project, the SPI deals with the project schedule. 4 is incorrect. AN SPI does not reflect the percent complete of the project.