If SPI equals 1 the project would be completed on planned time; if it were less than 1 the project would be completed more than planned time; if it were more than 1, the situation would be in the opposite. In similar way, it could be forecasted the cost of project by using CPI. Various states of SPI and CPI could be seen in Figure 2 [1]. For the calculation of EAC for the project cost the following equations are generally used: