The iModel combines all the graphics and business data intelligence, as defined by the design application, into a single deliverable container for distribution. Because an iModel optimizes the business data, the result is decreased file size and easier navigation. An iModel contains links back to the original source data from which the iModel was derived, facilitating the life cycle review workflow. An iModel is always saved with an .i.dgn extension.

An iModel does not require any special application to open and use the .i.dgn file. Any V8i (SELECTseries 1) or later edition application that supports a DGN file can open an iModel. It is a read-only file, which prevents any corruption to the source file and it keeps the information secure. An iModel shows the design at a certain state, which makes it useful for version control and iterative workflows. The iModel is designed for information reuse; it can be published into standard formats like PDF and XML.