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Background: The need for methodological support of computer-aided design is caused by several factors. Firstly, automation induces significant and sometimes radical changes in the design technology. Secondly, the implementation of information technologies in the volumes ensuring the efficient use of software and CAD information systems is a serious problem for some designers as scenarios of design procedures and operations in the CAD environment are complicated and have numerous variations depending on the context and the designer’s experience to solve such problems. The contextual dependence of computer-aided design scenarios makes off-line methodological support (reference guides, computer manuals) inefficient. Therefore, it becomes necessary to give methodological support directly in the process of computer-aided design. This problem can be solved by developing an adequate scenario model that allows us to quickly identify the current status of a project, to assess the actions of the designer to change this condition and, if necessary, to form corrective action. Materials and methods: We have compared different mathematical development platforms in order to develop a designer action scenario model meeting these requirements by using the colored hierarchical Petri nets and CPN Tools application to model and validate such nets. Results: We have developed a model of designer action scenarios in the CAD AutomatiCS environment based on the colored hierarchical Petri nets and proved that the models meet the requirements of the operational methodological support. Conclusions: The proposed scenario model is an adequate data base to provide online methodological support. The application of the obtained results as part of a methodological support complex requires special software for the interception and interpretation of primitive user actions with CAD interface elements.

Modeling of user activity scenarios in a Petri net-based CAD environment