It is now 45 years (1974–2019) since C. Eastman theorized what would later become known in the world as BIM (Building Information Modelling). After 45 years, it seems strange that a methodology or the use of some related tools are still seen as an exception to practice, as an eternal novelty or a hope, partly (evidently) unfinished.

Alongside to some excellences as USA, UK and Scandinavian countries, but nowadays also France and Italy even if still little known, there are still large areas in the world where BIM is not applied with continuity. In the same way, we should consider that also in the countries that are most advanced in this change, it is not uniform but spreads like a cheetah stain. First, it is integrated in the larger design firms and projects and then, with difficulties, it starts its diffusion to the entire market and all the other small stakeholders. Starting from architects and engineers, followed by the construction companies and only at the end the clients. On the one hand, it will be said that BIM is a silent revolution, and thus, it needs more time to emerge. On the other hand, that there was a push to accelerate too much a sector (the construction sector) that was not ready for a so radical change and thus we should give the necessary time for a double jump; the one related to the mentality and that related to the tools.