During this year, as a CATIA Champion, I had the opportunity to use, thanks to Dassault, the most updated version of 3DEXPERIENCE Platform with many intresting apps. I found particurarly useful the "Mechanism System Design", in combination, of course, with "CATIA Motion Design Design". Thanks to these tools, I had the opportunity to analyze the parameters of a complex kinematics of a door. During the development of these components, a lot time is needed to find the right lay-out and, moreover, each change must be tested and verified. Thanks to CATIA Motion Design, the calculation time is drastically reduced because, in a few seconds, it is possibile to plot the constraint reactions and the output forces on the joints for the entire duration of the simulation (through graphs). It is possible to import the information from CATIA v5 or 3D Exp and, thanks to a very useful feature, the system transforms the geometrical constraints of the CATProduct into joints and couplings of the kinematic itself, avoiding the user to re-enter the necessary information.