Therefore features can be seen like a sequence of geometric operations (building blocks) that has an engineering meaning for product definition. The main expected benefits from these systems are the optimisation of the user productivity in modeling and the reduction of the modification time. CAR BODY DESIGN METHODS. The methodology was based on P/A CAD but also on the concept of archetype. An archetype is a set of logical and parametric features of an object or system that can be used to build the relative CAD model [5].

The component level is managed by engineer that has the responsibility to develop the relative group of nodes and beams, with specific archetypes. Company emphasis is focused on modifications management because it affects on product development time and, consequently, on the process flexibility related to styling modifications, continuous refinement and new concepts implementation. In that way, each modification can be executed in a short time, respecting all the product and process constraints.

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