Estimator Question:

This is a measure of the cost efficiency of budgeted resources expressed as the ratio of earned value to actual cost. A CPI of 1.0 means the project is exactly on budget, that the work actually done so far is exactly the same as the cost so far. When CPI is greater than 1.0, it is under the planned cost and when it is less than 1.0, it is over the planned cost.