perspectives. We suggest to embed in the decision support system part of the decision maker(s) decision schemes and mutual influences in order to transform the DSS artifact into an instrument that will allow its users to adapt their own cognitive models of the task. Examples are presented in the individual and collective decision processes, explaining the way the users can interact with the system. This leads to propose to orient future DSS research towards supporting decision makers themselves, thus possibly defining a concept of decision making support system to be in agreement with human-centered design main principles.