Towards Design Method Based on Formalisms of Petri Nets, DEVS, and UML

Software system development uses specific development techniques and processes to reach desired goals, whereas different kinds of systems usually need to use different approaches. Obviously, there are used different techniques, tools, and formalisms in each development process and the designed models should be automatically or manually transformed to the next development step. The paper is aimed at such development processes, which work with formalisms allowing to design architecture and functionality, analysis of design, testing and system run with no need to change this formalism. Nevertheless, there can be useful to combine more different formalisms and model languages because of developers are used to use these formalisms or there are already created models using these formalisms. The paper deals with UML, Petri Nets, and DEVS application in the systems design and sketches a method how to use the formalisms for modeling a system architecture and its behavior. Its combination decreases a number of transformations of models and makes the architectural description well-arranged.