The various subsets of BIM are described in terms of dimensions — 3D (object model), 4D (time), 5D (cost), 6D (operation), 7D (sustainability), and even 8D (safety). This multidimensional capacity of BIM has been defined as “nD” modeling as an almost infinite number of dimensions can be added to the building model.
We Tech United 4D model links construction activities to time schedules and 3D images that result in a real-time graphical simulation of the construction progress. The “time” dimension enables the evaluation of the build ability and workflow planning of a project. Everyone involved in the project can easily and effectively visualize, analyze, and communicate problems in the sequential, spatial, and temporal aspects of the construction progress. This results in better schedules, site layout and logistic plans that generate improvement in productivity. The 5D model adds the dimension of “Cost” to the BIM model and allows instant generation of cost budgets and financial representations of the model against time. This improves the accuracy of estimates, minimizes dispute incidents that CAD data usually cause, and allows cost consultants to spend more time on improving value.
The 6D model enables facilities management to be added to the BIM. Adding rich description of building elements and engineering services with elaborate descriptions to the geometry, relationships, and property capabilities make the BIM a perfect facilities management database. The 7D model incorporated sustainability components to the BIM — it allows for professionals/designers to meet carbon targets for a specific element of a project and validate decisions or test and compare options.
The 8D incorporates safety aspects in both the design and the construction process.
BIM and allied quantities technologies provide opportunities for the project but also challenges for the project manager. As automation is increasingly used in quantification in the construction industry, BIM models will need to adapt accordingly to allow for more sophisticated management components that incorporate 4D time and 5D cost modelling and sharing this information with the project team in an integrated project delivery approach. However, BIM is just not about new software and technology. It requires an alternative way of thinking and a different approach to project procurement and delivery. It is imperative to move from the traditional approach of project participation with separate information pools and incompatible software technologies to one that is totally integrated with a common platform where participants can share and work on the same information. The BIM is the ultimate tool for construction.
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