Indeed, given the requirements of the current economic market, an information system, whatever its scope, is located by default in the course of trade and economic development of its market, but we already know that both in Tunisia and in the rest of the world, it is almost evident that the accelerating pace of development of new information technologies and the expansion of the network of networks known under the heading "Internet" asks day after day, more attention from us in order to meet the needs created by the digital electronics and in our society, of course, not to say that the habits of the virtual already beginning to sit in middle of our lives .