Education as cybernetic system

Main idea of the paper is to look into education as to complex adaptive system from the cybernetics point of view. There is described the way how to define the system, with application to education and hierarchical structure of cybernetic system as well, in the paper. The variety and Ashby's law of requisite variety is explained and applied to education system. Every system has its surrounding, it is also the same in case of education system. Its surrounding is a practice. The advantages of mutual interconnection between the theory and the practice are shown and the risks of its absence are pointed.