quantity of alternative variants, the analysis of limitations and consequences of decisions made. "The system is a set of interacting elements ", said Berthalanfie, one of the founders of the modern General Theory of Systems (GTS) emphasizing that the system is a structure in which elements somehow or other affect each other (interact). Is such definition sufficient to distinguish a system from non-system? Obviously, it is not, because in any structure its elements passively or actively somehow interact with each other (press, push, attract/draw, induce, heat up, get on someone nerves, feel nervous, deceive, absorb, etc.). Any set of elements always operates somehow or other and it is impossible to find an object which would not make any actions. However, these actions can be accidental, purposeless, although accidentally and unpredictably, they can be conducive to the achievement of some goal. Though a sign of action is the core, it determines not the concept of the system, but one of the essential conditions of this concept. "The system is an isolated part, a fragment of the world, the Universe, possessing a special property emergence/emergent factor, relative self-sufficiency (thermodynamic isolation) ", said P. Etkins. But any object is a part or a Universe fragment, and each object differs from the others in some special property (emergence/emergent factor - a property which is not characteristic of simple sum of all parts of the given system), including a place of its location, period of existence, etc. And at that, each object is to a certain degree thermodynamically independent, although is dependent on its environment. Hence, this definition also defines not only a system itself, but some consequences of systemic nature as well. Adequate/comprehensive/definition of the concept "system" is possibly, non-existent, because the concept "goal/purpose" has been underestimated. Any properties of systems are ultimately connected with the concept of goal/purpose because any system differs from other systems in the constancy of its actions, and the aspiration to keep this constancy is a distinctive feature of any system. Nowadays the goal/purpose is treated as one of the elements of behavior and conscious activity of an individual which characterizes anticipation/vision of comprehension of the result of activity and the way of its realization by means of certain ways and methods. The purpose/goal acts as the way of integration of various actions of an individual in some kind of sequence or system. So, the purpose is interpreted as purely human factor inherent only in human being. There's nothing for it but to apply the concept of "purpose/goal" not only to psychological activity of an individual, but to the concept of "system", because the basic distinctive feature of any system is it designation for some purpose/goal. Any system is always intended for something, is purposeful and serves some definite purpose/goal, and the goa...