International Association of Scientific Innovation and Research (IASIR)
The increase and diversification of information has created new user requirements. The problems of representation, processing, analysis and reasoning on the information, especially the uncertain information, are still an important research topic. The authors try to show in this paper how this issue is crucial. It is essential to propose new approaches to formally represent uncertain information to help machines understand and infer new knowledge. At first, they will start by defining the Bayesian networks, the way of it construction. Then will then focus on probabilistic ontologies and their relationship with Bayesian networks.