Modeling is a powerful method of scientific knowledge, where a real object is represented by a model. The main types of modelingare mathematical and full-scalemodeling.Full-scale modelinghas rather limited application. In most cases, preference is given to the use of mathematical modeling. In order to develop adequate mathematical models of processes occurring in information systems, it is important to choose appropriate mathematical apparatus. The article is devoted to analysis of the issuesconcerning choice of mathematical formalism to develop models of information systems.
information system, mathematical modeling, simulation, mathematical diagrams, Petri nets, evaluation nets