Today, we have no pressing tasks, so let’s discuss the comparison between BIM and CAD, focusing on three major transformations. What exactly are they?
First, there has been a significant shift in design expression methods. Over the past 20 years, the widespread adoption of CAD (Computer-Aided Design) technology has enabled architects and engineers to transition from manual drafting—a practice used for thousands of years—to digital drawing. This shift from drawing boards to computer-generated graphics marks the first revolution in engineering design. Editing and duplicating digital drawings on a computer is highly convenient, greatly enhancing both work efficiency and the quality of the outputs. However, CAD’s original purpose was to assist design, but in reality, it has mainly served as an aid for drafting. BIM has introduced a second revolution in engineering design by moving from 2D drawings to 3D design and construction models. Furthermore, for the entire construction industry, Building Information Modeling (BIM) represents a genuine information revolution.
Second, BIM improves information sharing among project stakeholders, fostering more effective collaboration. Traditionally, it has been difficult for non-specialists to access comprehensive project information, limiting their ability to contribute meaningfully at various stages. The 3D information modeling approach of BIM is more intuitive and easier to interpret, breaking away from the conventional CAD outputs that are often fragmented across different disciplines and expressed with varying levels of detail and classification. This allows the construction team, design team, contractors, supervisors, and end-users to gain a clearer, more holistic understanding of the project. It reduces the barrier for non-experts to comprehend the project details and enhances cooperation across different professions and participants.
Third, BIM enables information management throughout the entire lifecycle of a construction project. Unlike CAD’s traditional 2D drawing software, BIM initially creates a 3D model that accurately reflects the actual building. In the conventional design process, the designer visualizes a three-dimensional space, then translates it mentally into two-dimensional plans, elevations, and sections. These 2D drawings are then used by implementation teams to reconstruct the building in three dimensions. This back-and-forth between 2D and 3D often leads to information loss, resulting in a final structure that can differ significantly from the original design concept.
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