Rene, There is no specific gear design module. However, this subject can be explored in several places. (1)Search the Pro/E Knowledge Base by clicking the SUPPORT tab in the PTC Home Page and entering "Gear". (2)Search this forum in a similar way; the subject has been raised numerous times. (3)Look at the detailed Pro/E design of gears that are available as 3D CAD Model downloads from various vendors. (4)Search other general CAD forums. Various general methods can be used to generate gear tooth geometry. The method shown in the Knowledge Base involves a Variable Section Sweep Surface where an involute is iteratively calculated using the parameter trajpar. You can also create a Curve By Equation using the parameter t, and copy it in a Sketch for a Protrusion, Cut or Surface. You will find more detail exploring some of the above resources. David