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The increasing complexity and competition in the car market pushes OEMs to simultaneously achieve both a lead-time reduction and a higher development process productivity. Therefore, car manufacturers are asked to significantly revise their development and production procedures, together with their suppliers who are co-designers vehicle-systems (seating, dashboard, lighting, etc.). Innovative CAD tools, such as parametric and associative (p/a), may significantly increase efficiency and effectiveness of design activities, through assisted procedures, automatic checking of constraints, avoidance of repetitive handle operations. By this way, p/a CAD tools may reduce the time requested for geometry description and modification, leaving the designer more opportunities for studying the design solution.