There are various ways of defining cybernetics. (1) Some recognize it in the so-called problems of information, when they are concerned with the transmission, elaboration and conservation of information. (2) Some consider it as the science of command and control in machines and in animals. (3) Some refer to it in studying the two aspects of automatism. (4) Finally some see in cybernetics the study not so much of the mechanisms which provide results that were previously provided by man, but rather of the superior and intelligent activities of men themselves, in order to analyse and describe them in terms which make possible their reproduction in a mechanical model; cybernetics being in this case the study of the mind.