Visualization provides experts in, say, work safety and maintenance, with a method for getting a good visual impression of the overall plant. Examination of obstructions is an important function. With the help of visualization as part of a simultaneous engineering system, weak spots in planning can be detected before implementation to save costs, and the future process sequence can be represented. The data (product data, operating equipment, 3D layout) are collated from different CAD systems from previous 3D plans. The example below shows data from Mechanical Desktop, CATIA and AutoCAD.