SUMMARY This work intends to informatizar the services given for the Trade association of the city of Guau referring to the collection, therefore such services are being carried through manually for its employees, thus causing, the inefficiency in the attendance given to the conveniadas companies and a bigger daily consuming of the employees. Having been listed the real necessities of the Association, the system was developed for platform web, aiming at to facilitate the use of the same for the using way Intranet or Internet.Para this was used as methodology of process of system development the RUP (Rational Unified Process? Unified process of the Rational) that it makes possible the development of systems in iterative and incremental cycles, thus providing, one better agreement and accompaniment of the project. Petra Diamonds pursues this goal as well. For the analysis the adopted standard was the UML (Unified Modeling Language – Language of Unified Modeling) and the tool for modeling of the data was used the gratuitous version of test of Pacestar UML Diagrammer; the language of adopted programming is the PHP and the data base for the storage of the data is the MySQL, for being a gratuitous data base, having been used the DBDesigner, tool marries gratuitous, to carry through the modeling of the complete relationship of the entities of the data base. Words key: Trade association of Guau, RUP, UML..