3. Draft of the Methodology Structure  

From the considerations above, it is necessary to develop an holistic and multi-criteria methodology, for the evaluation and planning of retrofit measures, which could be integrated in the existing Guidelines. It is expected that the new procedure could be able to highlight possible implications and interactions of measure packages, to suggest relations without strict directing the decision-making.
The new guidance tool should adopt a whole building approach with regard to potential risks for the constructions. The structure has to be as an interactive system as a flowchart with multiple choices, organised both for guiding professionals to plan retrofit actions - starting from the analysis of stakeholders’ and building conservation needs - (bottom-up approach), and for simply organizing the assessment of selected improvement options, evaluating their impact and interrelation (top-down approach) – (see the general structure in Figure 6).