## 2 Materials and Methods
### Application of the Protocol and Assignment of Scores  
The attribution of scores represents a crucial element in the evaluation process of the certification protocol. For example, a higher score was assigned to the macro-category of \"Prevention and reduction of pollution\" [22; 23; 24; 25], because all types of pollution that the construction process can cause were considered, from air pollution to noise pollution, also focusing on water and soil pollution and also introducing the issue of excessive vibrations caused by construction site vehicles and the work itself. Since it is mandatory to respect them, the choice was made to assign the same score to the prerequisites, regardless of the macro-category to which they belong (1 point for each). The maximum score obtainable for a construction site is one hundred points. Since it mandatory to comply, the choice was made to assign the same score to the prerequisites, regardless of macrocategory to which they belong (1 point for each). In general, the breakdown of scores for each macro-category is reported:  
- Mitigation of climate change: 10 points;  
- Adaptation to climate change: 10 points;  
- Sustainable use and protection of marine waters: 15 points;  
- Circular economy: 20 points;  
- Prevention and reduction of pollution: 30 points;  
- Protection and restoration of biodiversity and ecosystems: 15 points. The maximum score obtainable for a construction site is one hundred points (see Figure 3). Obviously, the score must be calibrated based on the type of work carried out on the construction site; the protocol was drawn up to be a valid reference for any type of construction site (demolition, renovation, recovery, conservative restoration, new construction, etc.) and for any context (urbanised area, historic centre, lake environment, natural landscape subject to constraints, etc. ), so further reasoning is needed in the methodology for obtaining the final score. If a requirement is found not to be applicable to the specific construction site due to the nature of the work or the location being different from that cited by the requirement itself, the score relating to that specific requirement not applicable to the construction site being verified must be subtracted from the total score (one hundred). For example, if the construction site is not located in a place where there is local shrub vegetation, then requirement 6.1.3: \"Do not use trees for driving nails, supports and for installing lighting fixtures, electrical cables, etc.\" for the score of 1 point, is not applicable to the construction site, and therefore the maximum score achievable by the same to be referred to will not be one hundred points, but ninety-nine points. Figure 3: _Cont_. To obtain the Sustainable Construction Site Certificate (ACS), it is necessary to register the construction site on the control checklists, noting down all the data relating to it and providing a brief description of its location and the salient features of its organization, highlighting its critical issues. The work carried out must also be described, attaching the timetable if necessary. Subsequently, it is essential to design the construction site based on the strategies and guidelines provided by the protocol itself, an example of which is given in the paragraph on the application to the construction site, and evaluating, through the system of requirements, the score obtained by the construction site. Based on the score obtained, the certificate presents a division into classes, along the lines of the energy classes of an Energy Performance Certificate (EPC) of buildings:  
* Class A: score from 80 to 100;
* Class B: score from 60 to 80;
* Class C: score from 50 to 60;
* Class D: score from 40 to 50;
* Class E: score from 30 to 40;
* Class F: score from 20 to 30;
* Class G: score from 0 to 20.