NOTE : Definition of engineering: adequatio rei et intellectu, to insure the work mastery of operations linked with the savoir-faire of different kinds of actions, undertaken by another organization in its activity to determined goals by one of its possible characterization: as far as a product or a following of actions are concerned, or an intern or extern event determined in time, and generally speaking, every action implying a body of informations, whose appropriate capture by their respective audiences is likely to improve the adequation of Reality between any organization and its global image. The setting up of this adequation is economic. Therefore it produces some value.