||During the various phases of the A/E/C life cycle, several kinds of project data will be generated, shared, and updated by many project participants. In particular, these participants will store and retrieve the schedule information according to their needs. This is the due to the fact that the schedule information is subject to several kinds of project constraints. Therefore, many researchers have been attempting to realize the object-oriented integrated environment for linking CAD and planning or scheduling systems, or the knowledge-based expert systems for planning and scheduling. On the other hand, at the construction planning and consthction management stage, safety management is a one of the key issues in avoiding the delay of construction work. Therefore, Shimizu Corporation has been developing an accident prevention system. This paper describes the development, present status and future directions for the integrated environment between scheduling information, and an accident prevention system using domain specific models in Shimizu Corporation.