Provides methods and software tools for both nominal CAD modelling and variational analysis in mechanical assemblies. Main tasks of COGITO Lab dealing with: 3D CAD parametric modelling, using top-down or bottom up approaches; digital Mock-Up simulations; Digital Prototyping and FE Simulations. Further tasks deal with industrial engineering design as Assembly Oriented Design, Geometric Dimensioning and Tolerancing (GD&T); Computer Aided Tolerancing (CAT) for rigid and deformable assemblies.