The BIM approach revolves around a source of project data called the information model.
The information model is an aggregation of a library of intelligent BIM objects linked to a database rich in non-graphical metadata.
It contains geometric data on the building elements, a description of the properties of the building components, and details of the interrelationships between these properties and the building components.
When an update is made on the BIM objects, elements, and components, it automatically updates the relevant views (3D, plan, sectional, elevational, and detail) and non-graphical and cost-related data found in the elements’ schedules.
Depending on the stage of the project, the information models developed will contain varied data and be named depending on that factor.
For example, a design intent model is developed during the design stage; the model is then developed into a virtual construction model when it is passed to the contractors and sub-contractors; and an asset information model is intended for use within the operations and in-use phases of the project.
Typically, the project team will agree on the Level of Development/Definition (LOD) in the earlier stages of the project. This will be incorporated into a document called the BIM Execution Plan (BEP). LOD describes which graphical and non-graphical information should be contained in the model as it develops across all stages of the project.
This brings us to the BIM dimensions, which represent the fundamental uses of BIM across the various project stages.
