The joint assessment of the models of different designers should be started in the early design phase if models are also generated by other designers apart from the architect. The BIM coordinator or Head Designer usually assumes the responsibility for model merging, but it can be allocated to another party as agreed upon on a project-specific basis.
Visual clash detections are performed at this point on the merged model concerning the spatial reservations of at least structures and systems. This makes it possible to verify that the systems and structures are in principle compatible and that the spatial reservations required for structures and systems have been taken into account in the architectural design. Other checking may also be performed on merged models depending on the nature and degree of complexity of the project.
Checking to ensure that the models are error-free is essential for the approval of the design solutions and for the further activities of the project. The purpose of the checking is to ensure that the content and structure of the models correspond with the BIM requirements. At the same time, the quality of the design solutions and the reliability of quantities data are also ensured.