The block “Decision” represents the actual decision made by the decision maker based on the results of the multicriteria analysis. As discussed in the previous paragraph, if a single set of external factors u(m) is considered, the decision simply corresponds to the control option with maximum score in (3). On the other hand, when multiple sets of external factors {u(1),…,u(M)} are considered, it is unlikely that the same control option turns out to be the best under all external conditions. For this reason, the DSS should provide a decision which is as robust as possible with respect to the variability of the external factors. This uncertainty on the DSS outcomes (induced by the uncertainty on the external factors) is taken into account by treating the scores of the control options provided by the multicriteria analysis as random variables, as described in the following.