In Artificial Intelligence, an Ontology is a formal language used to represent adequately the information existing in an environment. In common life reasoning, it is very difficult and time consuming to revise ontology when its inadequacy is sanctioned by some paradoxical information. In order to facilitate the ontology building, we propose a conceptual framework managing interactive Ontology formation with respect to the "logic of the scienti.c discovery". In this framework, ontology is produced by human interacting with Rational Agents that localize the source of paradoxes. We present how the methodology is applied for ontology building in Law.