Modelling of economic phenomena and processes, in terms of their static and dynamic features and with regard to discrete or continuous characteristics of their course, is a major methodological trend in the studies of nature, properties and functioning of contemporary management systems. On various levels and in different areas, these systems comprise subsystems of programming, planning, organisation, motivation, implementation and control, both in the reality sphere as well as in the information and regulatory one. In practice, one may also find such perspectives of those subsystems which are focused in subject matter on economic and technical problems. All depends on what fraction or aspect of reality originating from the natural world or intentionally constructed by men constitutes the object of researchers’ interest. The models being created may be of forecasting nature, thus continuing the retrospective study of phenomena and processes, or may emerge as solutions developed by disregarding the past experiences and analyses. A different approach to reality modelling is representing the existing state of matters as accurately as possible, and on such a basis, making an attempt to enhance the structures and functioning principles of the phenomena and processes studied. Two different concepts of model building may be assumed.