The codified representation and measurement of the traditional city, of historical centres, of their urban shape and typological components (architecture and technology of the façades, materials, and colours) is devised to encourage a process innovation and to facilitate the restoration and maintenance of the urban heritage. The historical centre of European cities is, by its own nature, a complex place whose image and urban culture must be preserved by the use of appropriate guidelines. The “Colour Plan, An Architecture, Material, and Colour Design Code for the Historical Centre” is an urbanistic tool whose prescriptions act as fixed guidelines for all the interventions carried out in the area covered by the Plan itself, i.e. the historica...