There is an important question that we need to answer after any analysis. How efficient do we need to become in the remaining time of the project in order to achieve success?. Clearly, the answer has two dimensions: time and cost. The classic theory has an index to answer the question in the dimension of cost. This index is the To Complete Performance Index (TCPI). TCPI could be obtained by dividing the work remaining by the budget remaining.
`TCPI=(BAC-EV)/(BAC-AC)`