Strategic planning in the old towns' preservations. A valuation-generative pattern for the urban fabric rehabilitations

The old town of Ragusa is getting through a process of progressive enhancement in some different directions. Its differently valued parts need to be comprised in a whole valorization strategy connecting the decision making process with functional and symbolic values. In such a multi-layered urban sub-system, the architectural unit can play the role of main information/value units which the valuation/decision making pattern starts from. The pattern works as an impact assessment tool, which generates a great number of intervention strategies in order to maximize different and conflicting objectives and provides for each of them an axiological profile aimed at defining a trade-off scheme between them. Some GIS tools and a WebGIS interface allow the real-time control of the different scenarios envisaged in the decision making process.