As indicated in Fig. , the SAS calculation time is approximately half that observed in the solution by the explicit Euler method. The advantage of the SAS is, therefore, evident: not only is it unconditionally stable -unlike the explicit numerical methods that can diverge depending on the step size -, but it also requires significantly less computation time when compared with the other numerical methods. However, as will be demonstrated in Section 7.3.4, if 𝑘 9CD < 10 M , SAS behavior becomes erratic.