Top 2D is the first a mechanical application of QS. In the beginning of ’90 years we thought to improve the performance of AutoCAD using the method of the old CAD ME10. We added utilities, library and also the possibility to do the list, means the document having the characteristic described the project. Today we use Top 2D on AutoCAD, AutoCAD LT and BricsCAD. Manu engineering departments and companies of all sizes have choose our experience in this sector by adopting our solutions.