Nowadays, information systems combined with the Internet, have a significant role in data storage, as in the efficiency and promptness of data transfer and can offer a large contribute in managing and manipulating the information resulting from treatment and attendance of chronic patients, as hemophiliacs. On the other hand, the Internet also created the opportunity of patients to insert data concerning home treatments. This paper briefly describes the modeling process of a Web-based information system to help the management of inherited bleeding disorders integrating, diffusing and archiving large sets of information from heterogeneous sources in scope of the hemophilia care at the Hematology Service of Coimbra Hospital Center, in Portugal.