The paper is devoted to the interplay issues between ontology engineering and cognitive psychology. It describes the study targeted at new visual structuring paradigm of ontology development. Such approach is formed with regard to personal cognitive features. The research was performed within the KOMET (Knowledge and cOntent structuring via METhods of collaborative ontology design) project. Two phases of research have been done within the project. First was devoted to study of correlations between the expert’s personal cognitive style features and the peculiarities of expert’s subject domain ontology development procedure. The second deals with a research of relationship between the expert’s individual cognitive style and the collective ontology design (including the design performed in groups consisting of experts either of similar or of different cognitive styles). The results of this research project can be applied to organizing the collaborative ontology design, data and content structuring and other grou