Casati & Varzi Our research interest center on the link between logic, semantics and ontology, and we worked out some of the fundamentals of spatial representation (which primitives are to be privileged? which representational format?). Part of our current research is funded by a NATO grant; we are working on a book, provisionally entitled "Res Extensa", on the ontology of spatial entities. Roberto participated in a ESF School in Spatial Representation in Barcelona and in a GISData Specialist meeting in Napflion. He also cooperates with Barry Smith on a long-term project on ontology for geography. We are interested in how ontological knowledge can be impremented in real life applications.