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User modelling shells and learner modelling servers (LMS) have been proposed in order to provide a reusable user/student model over different domains. Open and inspectable student models have been investigated by several authors as a means to promote student’s reflection, knowledge awareness, collaborative assessment, self-assessment, arrange groups of students, interactive diagnosis, and the use of students’ models by the teacher. This paper presents SModel, a student modelling server used in distributed multi-agent environments. SModel server includes a student model database and a Bayesian student modelling component. SModel provides several services to a group of agents in a CORBA platform. In addition, SModel uses ViSMod to visualize and inspect distributed Bayesian student models. SModel has been tested in a multi-agent tutoring system for teaching basic java programming.