As a part of the EICAS methodology it is available a numerical optimisation tool which makes possible the automatic search of optimum performance to be achieved through a control system based upon a pre-established approximate model of the plant.

In fact the EICAS approach shows that the best achievable performance is an inherent feature of the pair “approximate model”–“fine model”.

By the definition of the pair, it is defined the approximation level of the plant representation through the approximate model and it must be assumed as a known fact, that the closed-loop control performance results theoretically limited only by the uncertainty of the model used for the control design.