## 7 Conclusions  
The most recent published research in Construction 4.0 pointed to BIM integrating with ICTs, i.e., SC. The development of BIM as an information repository with total accessibility is a clear trend. This is the first step to turn the BIM model into a DT. ICT plays a fundamental role in this process, providing the information to the model and capturing, analysing and facilitating the interpretation of the data hosted in the associated external DB. The integration of the DT and the DB stored in the cloud, as well as the access, processing, and visualisation, goes through the programming of applications for smartphones and web platforms that can be customized for each specific case.  
Technological progress in ICTs is advancing Construction 4.0 step by step. BIM and new technologies such as IoT and Big Data are the main drivers of SC. There has been a significant increase in studies related to Industry and Construction 4.0 in the last few years, but there has not been a breakpoint for their real implementation in AEC industry Projects yet. However, there are more and more real-world cases where this integration is put into practice, such as real-time monitoring systems using IoT devices.  
The integration of BIM-FM through ICTs allows decision making based on extensive data analysis. It enables the jump from corrective and/or preventive maintenance to predictive maintenance strategies, optimizing available resources according to these monitoring systems. On the other hand, the digitisation of infrastructures through BIM-ICT integration allows not only the optimisation of FM processes but also the development of management systems for the infrastructure itself and its life cycle.  
The future of BIM in project phases relies on the fact of being a solid base to be linked with other technologies. The potential results of implementing BIM with one or more technologies are quite higher than a single BIM implementation, especially in the O&M project phase. In this case, if only a BIM implementation is made, an important step to reach a smart management is started, but it seems not to be enough. Keeping a large volume of associated information and updating it in real time is complex and requires a large amount of resources to maintain the BIM model. It also generates large models and can cause deficiencies in the use of devices with lower hardware and file transfer capabilities. Therefore, the future of the AEC sector is based on the implementation of multiple technologies to reach the smart concept.  
Conceptualisation, M.G.A. and J.J.C.; Data curation, J.J.C.; Formal analysis, J.J.C., R.M.P., M.G.A., D.A. and A.C.; Investigation, J.J.C., R.M.P. and A.C.; Methodology, J.J.C., R.M.P., M.G.A., D.A. and A.C.; Resources, M.G.A.; Software, J.J.C., R.M.P., M.G.A., D.A. and A.C.; Supervision, M.G.A. and D.A.; Validation, M.G.A., J.J.C. and A.C.; Visualisation, R.M.P. and M.G.A.; Writing--original draft, J.J.C., R.M.P., M.G.A., D.A. and A.C.; Writing--review and editing, J.J.C. and M.G.A. All authors have read and agreed to the published version of the manuscript.  
This research received no external funding.  
Not applicable.  
The data presented in this study are available on request from the corresponding author.  
The authors gratefully acknowledge the financial support provided by the Ministry of Economy, Industry and Competitiveness of Spain by means of the Research Fund Project PID2019-108978 RB-C31. They also offer their gratitude to [PERSON] for supporting the Enterprise University Chair [PERSON].  
The authors declare no conflict of interest.