Résumé en anglais

The paper presents the concept of decision aiding process as an extension of the decision process one. The aim of the paper is to analyse the type of activities occurring between a ``client'' and an ``analyst'' both engaged in a decision process. The decision aiding process is analysed both under a cognitive point of view and an operational point of view: the ``products'', or cognitive artifacts the process will deliver at the end. Finally the decision aiding process is considered as a more general reasoning process to which recent artificial intelligence findings in argumentation could apply.