SPI is shown as a ratio
a. Enable a detailed analysis of the schedule regardless of the value of the schedule variance
b. Distinguish between critical path and noncritical path work packages
c. Provide the ability to show performance for a specified time period for trend analysis
d. Measure the actual time to complete the project
Answer: c. Provide the ability to show performance for a specified time period for trend analysis
SPI and CPI reason shown as ratio
Because schedule performance index (SPI) and cost performance index (CPI) are expressed as ratios, they can be used to show performance for a specific time period or trends over a long-time horizon. [Monitoring and Controlling]