Simpily put, BIM is a computer technology dedicated to the AEC industry to visualize architectural designs with 3D models and record building information with property parameters. BIM is like a virtual building established using a computer. Since the building information is complete and associated to each other, you can: 1. Modify designs easily; 2. Output design documents (2D/3D images, or reports) easily; 3. Analyze models with different software in order to comply with environmental requirements or make improvements.