## 6 Conclusions  
This paper firstly proposes a conceptual framework for an ICSPB-IoT by considering the application needs of government, contractors and owners. On this basis, this paper investigates the operation mechanism of an ICSPB-IoT at various stages from integrated design, lean manufacturing, transparent transportation, to intelligent construction. Finally, according to the IoT information chain, this paper divides the ICSPB-IoT into six levels and ten steps and builds the system according to the path from the unit layer, production line layer, workspace layer, to the enterprise layer. The results show that the ICSPB-IoT framework, subsystems and development paths proposed in this paper can provide decision support for construction enterprises and governments and provide references for improving and perfecting the intelligent construction system. This study has theoretical and practical contributions to existing knowledge. Theoretically, the ICSPB-IoT is based on existing research to improve the lifecycle information management of prefabricated buildings. First, the framework and system of the ICSPB-IoT proposed in this paper provide an integrated service platform for users of prefabricated buildings. Then, by analyzing the flow of information in each stage, this paper expounds on the operation mechanism of ICSPB-IoT to improve the collaboration and communication ability between users. Finally, the development path of the ICSPB-IoT proposed in this article provides a reference for application developers. In practice, an ICSPB-IoT is a system that serves the cross-stage, cross-organizational cooperation and collaboration of all participants in prefabricated buildings to achieve goals at various stages such as integrated design, lean production, transparent transportation, visual assembly, and intelligent architecture. In addition, government departments can visually monitor the quality and safety of projects based on the ICSPB-IoT. Furthermore, contractors can not only share information, but also further control their own business based on the subsystem of the ICSPB-IoT. For owners, ICSPB-IoT can provide digital engineering products corresponding to the building, tracking the quality and equipment in operation and maintenance stage of the building. Although different countries have distinctive systems and cultures--this paper takes China as an example to classify the participants--the service objects of the ICSPB-IoT covers almost all participants of prefabricated buildings, which in fact provides a framework for information sharing throughout the construction process. The stages and management tasks of prefabricated construction projects are similar in other countries. Thus, they can apply ICSPB-IoT to facilitate information sharing between organizations during construction according to their respective engineering management ways. For example, Europe and the America are powerful countries in industrialization and information technology in the world, their prefabricated buildings urgently need information systems to promote the development of integration. Governments, public agencies or housing associations of Europe and America can refer to the research model in this paper to realize the informatization of the prefabricated buildings construction chain. This study attempts to explore the development of ICSPB-IoT. At present, this field of research is still in its infancy. Therefore, there are several limitations to be further studied in the future. First, the effectiveness and practicability of the ICSPB-IoT proposed in this paper need to be investigated in practice. Future studies could be carried out from the following aspects: (1) Research on the construction and integration of subsystems based on the full lifecycle of prefabricated buildings, including the integration and collaboration of systems between design, manufacturing, supply, assembly and service.