The paper presents one approach aimed at harmonization of teaching ontologies based on the principles of ontological engineering. The research framework is targeted on development of methodology and technology that will scaffold the process of heterogeneous knowledge structuring. The structuring procedure is the kernel of ontology development. Ontologies that describe the main concepts of the domains are used both for teaching and assessment techniques. Special stress is put on visual design as a powerful learning and teaching mind tool. The examples are taken from the courses delivered in St. Petersburg State University at Graduate School of Management and St. Petersburg State Polytechnic University.