Figure 6. Display of the results: Checking of the operating constraints. Because of the stochastic nature of metaheuristic optimization methods, a very important segment of the OPF program is statistical evaluation of the results. When the user clicks on the button Statistics, a statistical evaluation of the optimal results which are obtained using the selected optimization method in specified number of program execution will be displayed (Fig. 7). These statistical indicators are: number of program execution, the minimum value of the objective function, the maximum value of the objective function, the mean value of the objective function, the standard deviation of the objective function, and the mean time of execution of the program. On the basis of these statistical indicators, a relevant comparison of different metaheuristic optimization methods can be achieved.