The administrator is more like the engineer who constructs a power plant, that is, he is concerned with the realization of conscious human purposes by the conscious use of human beings and materials. It is true that the mere student of administration may be just an observer, but he does not merely observe natural, unconscious, and automatic operations. He observes the formulation of human purposes, consciously and deliberately and operations designed to effect given results. And he sees calculations of results in advance realized later in practice with a high degree of approximation. The degree of approximation between advance calculations and results is not often, if ever, as exact as in the case of a hydro-electric plant, but it is constantly exact enough for practical purposes.