In the integrated project model, intelligent 3D models are the single source for all information and data (input and output) regardless of the discipline. So the integrated project model typically includes model data that is architectural, structural, mechanical and electrical as well. Data from virtually any discipline can be included in the integrated project model.

When an element is placed in the model it appears as a 3D element and becomes the source for all extracted 2D information. That information can take form as plans, elevations, sections, reports, schedules, and other documentation. The entire design process, from Schematic Design to Presentation, evolves and originates from this data. All design revisions are made in the model and 2D data is automatically updated.

The organization of model files needs to be considered fairly early in a project. Quite often the 3D master model will be made up of several DGN master models which are necessary for the development of all the various discipline and design areas. These master models typically include a Building (architectural) model (more than one usually), a Structural model, a Site (civil) model, a Plant model, a Mechanical model (HVAC and plumbing), and models related to other discipline specific areas. Some key project model considerations are:

• Establishing master models for major design areas, Building components, and discipline specific Building applications.
• Dividing master model areas into smaller models that can be completed by other project team groups working simultaneously. The smaller models are referenced into the master model.
• Limiting models to essential data; restricting detailing to construction documentation.