Essentially the equivalent of conceptual design, the model consists of overall building massing.
Model elements consist of generalized systems or assemblies with approximate quantities, size, shape, location and orientation.
Model elements are suitable for the generation of traditional construction documents and shop drawings.
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This level of development is considered to be suitable for fabrication and assembly (i.e. full set of construction documents including shop drawings)
The final level of development, highly detailed model is suitable for maintenance and operations of the facility, with all changes during construction documented (i.e. post-construction asbuilts)