The technical and commercial functions of a business are clearly defined, but the same cannot be said of the administrative function. Not many people are familiar with its constitution and powers; our senses cannot follow its workings - we do not see it build or forge, sell or buy - and yet we all know that, if it does not work properly, the undertaking is in danger of failure.
Henri Fayol (1900). "Henri Fayol addressed his colleagues in the mineral industry 23 June 1900." Translated by J.A. Coubrough. In: Fayol (1930) Industrial and General Administration. pp. 79-81