This article proposes a taxonomy of the conventional forms of coordination of the action based on the progressive weakening of their interpretability. After having proposed to weaken the load of rationality contained in the Lewis\'s convention, defined like Common Knowledge, one proposes to...

From a voluntary production, free software fulfil to be broadly diffused on the market side. The commercial success of these software is attented by an active participation in their development from a large number of firms. We explain this participation by the opportunities of free software...