The decision about which parameter should be modified in each trial depends also of the behaviour observed. Inthis point the expertise of the analyst to evaluate which parameter should modify is essential. In general, themodification of only one parameter in each trial seems more interesting because it permits to see more clearly theinfluence of this parameter in the thermal behaviour.Once the model has been adjusted relating to cooling curves, it is time to follow on the adjustment of theshrinkage defects. The parameters modified to adjust the magnitude of the shrinkage defects prediction are mainlythe alloy density and the parameters that control the porosity model used by the software, which are specific of it.