Cost Performance Index ( CPI) (ratio)
A Cost Performance Index ( CPI) threshold value is expressed as a ratio. An issue is generated if the CPI falls beyond the threshold values.
The Cost Performance Index is calculated as CPI = Earned Value Cost / Actual Cost . A value less than 1 indicates that actual costs have exceeded the value of work performed.
If the lower threshold value is 1, an issue is generated whenever the actual costs exceed the value of the work performed.