The O&M represents the most expensive phase of building’s life cycle. This is due to not correct maintenance practice, which includes lack of communication between stakeholders, loss of information during buildings’ life cycle and reactive maintenance practice. In particular, the last one can cause interruption of service in public buildings and rise of maintenance cost, but also the rise of energy cost since non monitored assets can consume more than expected. In addition, the poor use of BIM in operational and maintenance phase means a waste of potential information useful for FM. In this scenario it is fundamental a change of methods.