EVMS is a theory that forecasts project cost and schedule and is based on the hypothesis that the productivity rate declines during early and late stages of the project life so that the cumulative cash flow curve forms s-curved shape. EVMS, although it can be utilized in the analysis of project cash flow, does not generate s-curve itself, which means the cash flow curves must be prepared using external methods. The purpose of study is to provide such methods that implement s-curve models. It adopts Sigmoid curve model and can be utilized in the forecasting of project cash flow as well as the estimation of EVMS indices. A simulation of project cash flow is presented to demonstrate the procedure of spotting adequate curves for specified cases.