To interpret the results easily and keep the complexity of the system manageable, Tzeng [19] established a simplified normalized total-influence matrix (T^s ) ̂ using a normalization method and the threshold value θ. First, the normalized total-influence matrix T ̂=[(t_ij ) ̂ ]_(n×n) is calculated by using (6) to force the values of the matrix T within the scope of a measurement scale.