The document discusses the To Complete Performance Index (TCPI), which is a measure of the future projected cost efficiency needed to complete the remaining work of a project within its original or revised budget. It provides definitions of TCPI and contrasts it with Cost Performance Index (CPI). An example project is used to demonstrate how to calculate TCPI using formulas that take the budget at completion (BAC), actual costs (AC), earned value (EV), and estimate to complete (ETC) into account. Formulas are presented for calculating TCPI based on the original budget and when the budget has been revised.