BIM is the short form of Building Information Modeling. As the name suggests, the information presented in the model is highly and crucially significant. This information contains the data which is significantly influential in a project. Thus, modeling based on the information of a building, is not only  a basic computerized modeling ,but also Virtual construction of a building or architectural work with all its details with maximum resemblance to real construction:

This causes numerous problems and interferences of different manufacturing disciplines to be seen and solved in the design phase.

Building information modeling index includes some specifications as follows:

• The ability to design a project from phase zero to phase three information-based design architecture has the ability to run a project from 100 LOD to 500 LOD.

• Greater integration between disciplines in the design process and the parametric model: The parametric model does not mean a complex and bizarre model, but rather a set of interdependent elements whose change of component affects other components

• The ability to manage the next stages of the project during the design of BIM with a wide view of the project, it is possible to accurately view and manage the various stages of the project, which is called 7D or 7D simulation of the project.

• Metra Consulting Engineers Company, using Revit Autodesk and Navisworks software, which are the most powerful BIM software, and using experienced personnel, is one of the capable companies in providing BIM services.

• The special traits of Metra Company is that it takes advantage of this new feature in the construction industry with a creative and modern method in all construction disciplines.