In order to achieve any actual increase in the safety of industrial facilities it is necessary for the simulator to be as closely as possible similar to the real-life facility which a trainee will be employed to operate later. People working on the simulators can conventionally be split into four groups which can partially overlap and coincide: 1) equipment and control system designers, 2) simulator and trainer designers, 3) teachers and instructors, 4) trainees (testers). From the viewpoint of simulator functionality it is most desirable that the efforts to design and develop a simulator should as much as possible be concentrated in the first two highly qualified specialist groups. The personnel resources of these two groups, however, are limited and the designers can find solutions only for a limited number of simulation problems. Departure from the concept of an individual simulator design “from scratch” and the use of dedicated software packages allow to level down the qualification requirements set for such specialists as mathematicians, process flow engineers or software developers. This allows to draw the third group of specialists, i.e. teachers, instructors and other local specialists available, into the process of designing a simulator so that it will in every respect match the unique features of the actual facility simulated. Such specialists may sometimes have more profound knowledge about specific facilities than even system designers themselves. Given that this condition is met, a well-timed design and development of the number of simulators needed to ensure an actual increase in the industrial facility safety can become a reality.