“The notion of Common Good has known lately a new interest. For some it is the renewal of an old idea and the opportunity of giving to conservative forces of society the appearance of a modern approach. For others it is a way of coming out of a stereotyped vocabulary used by revolutionary movements and to propose a more acceptable way of expression. It may also be related with a radical criticism of the concept of modernity transmitted by capitalism and not challenged by real socialism. In order to develop this late conception, it is important to indicate three levels of its semantic utilization: Common Goods, Common Good and Common Good of Humanity.