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The architecture, engineering and construction (AEC) industry is epitomized by a wide range of project business lines, different project scopes, unique client requirements, and a rapidly changing automation technology. This current scenario requires a constant transfer of project data among the various professionals representing different specializations, project phases and interests. The implementation of improved computer techniques such as object‐oriented programming and CAD reduces fragmentation and enhances the efficiency of integrating project data through all stages of generation, sharing, maintaining, and updating. This reduced fragmentation will assist in bridging the gaps between and within the project phases, thereby increasing the competitiveness of the AEC industry. This paper presents different issues related to the existing fragmentation in the AEC industry and the challenges and approaches to achieve a meaningful and smooth integration. The paper describes the development of ODCSI—an object‐oriented design/construction system for integrating CAD and construction software applications. The system architecture captures design data in an object‐oriented project model and acts as an intelligent CAD interface. In the hierarchy of object‐oriented classes and subclasses, the design data are inherited; hence all functional, geometrical, structural, construction management, and construction engineering functions are shared across class boundaries. These design data are used as the input to various computer‐based construction software applications, hence providing seamless project integration.