Postoptimal analysis in a multi-attribute decision model for restoring contaminated aquatic ecosystems

We describe the evaluation module of the MOIRA system, developed to identif y optimal remedial strategies for restoring radionuclide contaminated aquat ic ecosystems and drainage areas. This module includes a multiparametric se nsitivity analysis, which is based on a multi-attribute additive value mode l, aimed at identifying optimal remedial strategies for restoring aquatic e cosystems contaminated by radionuclides. We introduce the sensitivity analy sis to check the robustness of the conclusions on the inputs. This provides insights into the problem in the sense of making better use of the availab le information. This analysis is focused on judgemental inputs, imprecise v alue functions on attributes and imprecise scaling factors or weights for t heir aggregation. These are of utmost importance in determining the optimal countermeasures.