This writing characterizes a moral proposal for the architecture and urbanism of the second half of the 20th century, elaborated by the art and architecture historian Sir Nikolaus Pevsner (1902-1983). The period covered by this study covers the origin, establishment and decline of modern architecture and urbanism (1900-1970).The text is divided into six chapters, which examine from the author's formative process at the university level, to the critique of his approach to the relationship between architecture and urbanism. Special emphasis in this work is given to the figure of Pevsner in the debate between the avant-garde and tradition in England, and his attitude towards the si1936 and 1971. Recent reviews of the author's work have also been examined.