Weber described many ideal types of public administration and government in his masterpiece Economy and Society (1922). His critical study of the bureaucratisation of society became one of the most enduring parts of his work.[21][23] It was Weber who began the studies of bureaucracy and whose works led to the popularisation of this term.[24] Many aspects of modern public administration go back to him and a classic, hierarchically organised civil service of the Continental type is called "Weberian civil service".[25] As the most efficient and rational way of organising, bureaucratisation for Weber was the key part of the rational-legal authority and furthermore, he saw it as the key process in the ongoing rationalisation of the Western society.[21][23]