BIM-Based 4D Modeling and Scheduling - Construction Project Scheduling and Control - page 394

Figure 15.1 An example of the representation of a building with BIM
managing building components in the form of intellectual objects. 3D smart models
of the projects are created, and all architectural, structural, electrical, and mechani-
cal components of the projects are codified, including information attached to each
object. During the codification, all information about the components (i.e., material,
labor, equipment codes) are defined in the context of objects and are utilized to extract
quantity takeoff and estimate project costs. Thus, with the use of BIM, semantically
rich 4D and 5D construction models can be created, and project scheduling and cost
estimating can be incorporated into the 3D models of the construction.
Differences between BIM and CAD
Computer-aided design (CAD) is the use of computer systems in the creation,
modification, analysis, documentation, and communication of a design. CAD systems
replace manual approaches with automated processes and software-based solutions,