The work of an information specialist is: take the most important from information in a document, organize this information in orderly and intuitive shapes equiping it with crtical, historical, technical and descriptive contributions. These are the tasks of all the mediatic structures that want to make easy to the readers the understanding of data and information in a document, hoping that this reader could become an author. This is an informative system. If a system for transmission is useful to transfer data from two points at least in a network, a informative system does the same with information, and a cognitive system does the same as well with knowledge. A DBMS, Data Based Management System, in not the same as a KBMS, Knowledge Based Management System
