process until an adequate answer is obtained, significantly exceeds the time available. This includes techniques such as computational fluid dynamics (CFD), finite elements analysis (FEA), and optimization of complex systems. Instead, these engineering tools are used to provide limited insight to the problem, to sharpen an answer, or to understand what went wrong after a bad design and how to improve the results next time. This is particularly true of CFD analysis. Computer-aided engineering (CAE): Integration of real processes into the virtual environment. Engineering is more than analysis and design. A methodology for storage and rapid access to engineering analyses, plant data, geometry, and all other qualitative and quantitative engineering data related to plant operation still needs to be developed. Engineering decision support tools. Optimization, cost analysis, scheduling, and knowledge-based tools need to be integrated into the engineering processes. Virtual engineering allows engineers to work with objects in a virtual space without having to think about the objects' underlying technical information. When an engineer takes hold of a virtual component and moves or alters it, he or she should only have to think about the consequences of such a move in the component's real world counterpart. Engineers must also be able to create a picture of the system, the various parts of the system, and how the parts will interact with each other. When engineers can focus on the making decisions for particular engineering issues rather than the underlying technical information, design cycles and costs are reduced. Software UC-win/Road and VR Studio by FORUM8 IC.IDO by ESI-Group Usual denomination Usually, the modules of virtual engineering are named as such: Computer-aided design (CAD): It designate the capability to model a geometry using geometric operations that can be close to real life industrial machining process such as revolution, dressing, extruding. The CAD module is made to ease the generation of a geometrical shape. It comes usually with other modules, such as an engineering drawing making tool. Computer-aided manufacturing (CAM): Even if the CAD provide an accurate virtual shape of the objects or parts, the manufacturing of these can be far different, just because the previous tool just dealt with perfect mathematical operation (perfect point, lines, plan, volumes). To take into account in a more realistic manner of the succession of manufacturing operations and to be able to certify that the end product will be close to the virtual model, engineers make use