cost performance index (PM) (CPI)
The Cost PerformanceIndex (CPI) is an index that can be used to determine the cost effectiveness of a project.
The cost efficiency is determined from the ratio of the Earned Value( EV) to the Actual Cost ( AC). If the ratio is greater than 100%, then the project was implemented at a lower cost than estimated. If the CPI value is less than 100%, then the estimated budget was exceeded.
The term Cost Performance Index is used in DIN 69901-5 for the Cost Performance Index.