Max Giordano is emeritus professor at the University of Savoy France. His research interests include geometry modeling, computer-aided design and computer-aided tolerancing, and he developed the concept of "domain" for the 3-D tolerance analyses and synthesis. François Villeneuve is Professor at the University of Grenoble (France) and vice-director of the G-SCOP research laboratory. His research interests include Computer Aided Process Planning (CAPP), Knowledge Management, Product Design and Tolerancing. In Tolerancing, he is developing a 3D geometrical model for product defects through the product life cycle. Luc Mathieu is Professor at the University of Paris-Sud 11, in the Department of Production Engineering (France). He is Director of the Automated Production Research Laboratory (LURPA) in the Ecole Normale Supérieure de Cachan (France). He is also a fellow member of CIRP (International Academy of Production Engineering). His research interests include geometry, computer-aided tolerancing, coordinates metrology and digital production engineering.