The greater metropolitan area of Havana would have been affected by the Plan Piloto; it included suggestions for the development of unbuilt areas and included the distribution of the four functions as outlined in the Athens Charter and as suggested by Le Corbusier's manifesto for planning which was published in 1943 for the Congrès Internationaux d'Architecture Moderne, (CIAM) and resulting in the Athens Charter}The Functional City, this was achieved through the principles of modernist zoning.