This unique indicator is indispensable to make visible the actors interdependence (variables) of a system and to understand all the management activities of a complexe set to permit a realistic optimization in a sens of"best functional solution métier possible" not an absolute value due to a simplified model.

Then, it can be used for solving or ingeneering types problems (mécanic, electronic , systems, simulation, banking, IT, Human Ressources,..) or all others activities needing a periodic or a real time estimation of processus, without prejudging about variables or parameters ni nor the functions of the problems, and thus in eliminating the need to define a model (analytic function, DoE, answer area, etc.) which will impose a determinist and limited answer.