Besides a lot of reports about CAD data exchange between participants in a building engineering process, there are few papers on CAD data management of the many various drawings made by different participants in a project. Drawings often have some relationships with each other, e.g. reference, therefore you must appropriately control the relationships between them to check the assembly consistency with superimposing heterogeneous drawings. The authors have developed an integrated system at the practical level, which provides the control of the relationships between drawings. The system is composed of CAD clients and a database server connected to a LAN.
