## 5 Conclusions and Future Developments  
The research issue of assessing the seismic vulnerability of existing buildings is still unresolved. For about thirty years, scholars and researchers have been working on quantifying the seismic vulnerability of historical buildings, following different approaches at different levels of detail (rapid, static, dynamic approaches, etc.). This open-ended problem is raising awareness among the public and owners of the need for implementing safety measures even on buildings not hit by the earthquake in areas with medium-low seismicity. In this work, we presented the application of a procedure for assessing the seismic vulnerability of an existing building based on survey tools already present in the guidelines of several Italian Regions. The procedure has proved to be effective and easy to use for a professional. The innovative part of the work carried out consisted of the graphic representation of the results obtained. Until now, the degree of vulnerability of individual elements or macro elements was only possible in tabular or diagrammatic form, not easy to understand for non-experts. In this work, the use of design in a BIM environment has been experimented. The adopted investigation procedure and the non-destructive diagnostic tests used allowed definition of, for each structural element, a detailed classification of its vulnerabilities and their weight on the overall building vulnerability. Therefore, in addition to the classic geometric, mechanical, and material characteristics, the use of a BIM model allowed associating to each structural element the presence of vulnerability aspects and their weight. By means of focused queries, specific vulnerabilities present in the building and the reached level of damage (measured as a weight on the total vulnerability) could be highlighted. The  
Figure 13: Multiple queries: presence of multiple vulnerabilities with different weights on the same element of the system. The coloring identifies the elements affected by all 2 vulnerabilities in the legend with their weights. graphic representation is very helpful to understand both the location of critical points and the problem severity. The owner becomes aware that the building presents problems and that the interventions have different degrees of urgency but are necessary; on the other hand, the designer has a tool to plan, in terms of time, the maintenance and adaptation interventions and to control ex-post the effectiveness of the interventions carried out. The procedure presented here served as a basis for planning the consolidation and safety interventions on Cascina Cuccagna in Milan. Critical issues in the floors of the South-West wing and of the South-East wing have been highlighted that require immediate static safety interventions. The floors in the corner area between the South-East and the South-West wings also turned out to be poorly connected to the perimeter masonry and require seismic adaptation. In addition, historical analysis and geo-radar survey of the foundations have shown that the South-West wing is posterior to the South-East wing; redrawing of the cracked pattern has shown a possible poor connection between the perimeter walls of the two wings. All these aspects have been reported in the BIM environment and expressed in graphic form. Thus, the designers were able to plan the most urgent interventions. Of course, designing in a BIM environment is not without difficulties. First of all, every element of the project must be precisely defined; if this gives great advantages to managing the construction site, certainly it is a not easy constraint in the architectural design phase. In fact, if the architectural design criteria do not follow the BIM environment logic from the very beginning, then the subsequent modeling in a BIM environment is not so easy.