Educational Institution:Moscow State Technological University “STANKIN” Project description: a parametric model of double-reduction gear-box is presented at competition. This is a high-level 3D model using all advantages of T-FLEX CAD parametric capabilities. Assembly is designed according to module concept that provides quick model regeneration. Adaptive fragments were applied to simplify and automate assembling process. They can change their dimensions in accordance with current parameters of 3D assembly.