As the use of 3D data throughout the produce lifecycle broadens, it is ever more essential to prepare high-quality 3D CAD geometry models to streamline the entire simulation process. CADdoctor is a tool to streamline CAD geometry preparation to make the data suitable for the HyperMesh simulation process. This helps to achieve reducing your simulation lead time and improving the accuracy of the simulation result. This presentation will be an introduction to one of the leading software on the Altair Partner Alliance and how this software has been benefitting users throughout the globe.