“…The two pronged use of ontologies has the dual functions of allowing humans to grasp the meaning of any element having a well defined vocabulary and, secondly, having formal semantics to support reasoning. Using semantic technologies as the key tech nology enables data management of the vast amount of medical data (see, for example, García Sanchez, Fernandez Breis, Valencia García, Gómez, & Martínez Bejar, 2008;Gomez, Colomo Palacios, Mayoral, & Garcia Crespo, 2008). This paper presents ODDIN, an ontology driven diagnosis sys tem which applies differential diagnosis and probabilistic statisti cal refinements in order to solve the shortcomings of current ad hoc hardcoded systems, which do not benefit from the semantic possibilities of applications based on medical data.…”