A feedback mechanism allows the decision maker to extend or adapt the set of control options according to his/her preferences and the multicriteria analysis. Indeed, analysed solutions typically bring a deeper insight and understanding of what the problem actually is, and how it could be better solved. Therefore, the decision process is often an iterated procedure in which several runs of the DSS are performed, and the set of evaluated control options is better defined and refined as the decision maker acquires knowledge on the problem. In the running example related to clam farming in a lagoon, one could start from a uniform sampling of the interval of admissible values for the lagoon surface dedicated to aquaculture. Then, after each DSS iteration, one could exploit the feedback mechanism to generate control options with a denser sampling in the most promising subinterval. The process stops when the considered subinterval is sufficiently small.