In assessing the working methods of the BIM we need to know, what information modeling is performed, for example, at the second BIM level (BIM 2), coordinated information modeling is performed, when PIM and AIM models are being developed.

These models are linked into one coordinate system, one common model is developed from the model of different disciplines. Visualizations, drawings, calculations, and other information are derived from the BIM model. In the first level (BIM 1), models are developed only for certain parts of the project, CAD technologies are used. If models are developed, they are not coordinated with each other. Standard 2D documents are usually provided as project results. 3D information models are used only to perform certain fragmented activities, such as calculations or visualization of a specific location.

In terms of IT infrastructure, the main differences are what technologies are used. At BIM 2 and BIM 3 levels cloud technologies are used, the information model or database is accessible to interested parties if they are granted rights. At lower levels, local area networks are used to transfer the required files to interested parties or upload them to the intended repositories. Working in this way no connections are maintained between files, links to each other.

The form of data management is taken into account when assessing data exchange. For example, at BIM level 2, is used Common Data Environment (CDE) with integrated task management. At the BIM 1 level, the structure of file directories is managed by the principles of a central repository, but it may not exist. At BIM level 2 data is transmitted automatically. Model creator works in its local location and the central storage system synchronizes the created information, files with the server in the cloud. BIM1 information is exchanged in a semi-automated way. BIM 2 uses software formats such as DWG, RVT, DGN, DB1, as well as open formats IFC4, BCF, CObie, GML. At BIM level 1, DWG, DGN, PDF files are used to transmit drawings and other graphical information.

In Level 2 BIM tasks are managed jointly and coordinated.. Project roles and BIM competencies are clearly defined and agreed. At lower levels there is no link between task management and traditional project roles.

When comparing BIM 1 and BIM 2 from the legal point of view, the main difference is that at level 2 compliance with accepted international national standards and classifications. At level 1 standards are only developed, adapted and used by project participants developed BIM / CAD standards. In this case, there are no BIM standards at level 0, At BIM level 3, the legal preconditions should be created to integrate the digitization of the construction sector into the overall strategy for the digitization of the European construction sector.