In the aeronautical industry, in terms of business success, to build, keep and improve the interface between vendor and buyer is more than a key point. Such achievement represents a differential factor for market competitiveness. Considering the long-term relationship and the engineering (design and manufacturing) interface as the most significant dimensions in the such interface. We believe that the “acquisition & contract” and “supplier development” are two fundamental pillars to build the best connection between vendor and buyer.