BIM Model Level of Definition – What can the Model be Relied Upon?


In the blogs in this series, we look at the structure of the BIM Model Level of
Definition Table

In the first blog in this series, we looked at how one might table the information for the BIM Model Level of Development as a whole. Now we can look at some of the categories, and how they are developed over the stages of the project. First up, what can the stage models be relied upon for?

Micrographics, BIM, Model level of Definition, Pass 1192-2-2013 Capital Delivery

The Brief Model. It must reflect the client brief, performance, requirements, performance benchmarks, and site constraints. Last mentioned, site constraints are critical for successful modeling, and real-world conditions and coordinate systems are crucial for effective collaboration. It is one of the first things I insist on when starting a project.

Then it is over to the Concept Model. Clearly, the model is better defined, and an initial idea is taking shape. The analysis and coordination item is the beginning of intelligence in the model. Initial capturing of model data can be used to plan the end estimate, even though it is not yet time to set in stone.

The Definition Model is really the final stage where the client should have input before the design is generated and constructed. The contractor is engaged, and the sequencing and estimation have started. Dimensions are correct and cost initial cost estimates have been generated.

Micrographics, BIM, Model level of Definition, Pass 1192-2-2013 Capital Delivery

Once the client has signed off on the Definition Model, it is time to go hell for leather and develop the Design Model. This is probably the most intensive stage of the modeling and documentation generation for the Models. Fabrication and Specialist design are completed, and a target and maximum price is given. If this is acceptable to the client, then construction can begin. If not then changes must be made or the project shelved.

During the Build and Commission Modelling stage, data is added to model elements that aid asset management.  Then it is time for Handover and Closeout, and finally maintaining the Operational Model.

In conclusion, a succinct description of what the models can be relied upon, and what the roles and responsibilities of the owner and supply chains must honor. If this is done, everybody wins.

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