Afterwords the Great War, the reconstruction period began in Italy, especially in the areas that had been the war theatre. This is an interesting phase from the point of view of Urbanism and, above all, of the Urbanism Technique and its evolution in the twentieth century, culminated with the approval of the Italian National Urban-Panning Law - LUN in 1942, which deserves more attention to how much to date was devoted to the subject by scholars of the discipline. This paper will try to highlight some key points: how did it work, that is, which urban-planning tools were used to implement reconstruction interventions even after the approval of the LUN; who has intervened in the various phases of reconstruction, that is, which were the relevant subjects; finally, if and how, after the First World War and the Second also, the tools implemented to plan the reconstruction have changed. Until the middle of the 1960s, the LUN was not really applied, so much so that it can be said that the beginning of its widespread application can be set in the second half of the sixties.
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