In modeling the reality, we rely on the knowledge we have, no matter whether it is real or imaginary, naïve or sophisticated, our mental models are mostly made up of fragmentary information based on a partial understanding of what is happening and a naïve psychology postulating causes, mechanisms and relationships where, in fact, there is none of them. The mental model is made up in order to understand an aspect of the outside world. In the process of mental modeling, the individual necessarily should use the previously gained knowledge and depends on the rate he sets an appropriate relationship between the previous knowledge and the new information delivered by the outside reality. When the individual works out a certain mental schedule, he may find out that this is inadequate to his aims. Now it is the moment when a new mental model start to be worked out in order to understand what is happening outside. Thus, the schedule role is to deliver the individual pre-requested knowledge aiming to understand the interaction process as well as the knowledge allowing him to understand the indications delivered from outside, at the same time, in which way his schedule differs.