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Modern manufacturing requires a flexible numerical chain of industrial products, in particular the relationships between CAD/CAM solutions and CNC. No longer can CNC controllers restrain their tasks at the execution of inflexible orders and choices made at earlier stages of the numerical chain. Thus, in a STEP-compliant environment, the CNC controller possesses a broad decision-making power to optimize the NC programming according to the machining equipment properties. The NC programming environment then has to face new challenges. In the first part of the chapter, an implementation method leading to STEP-NC advanced manufacturing is proposed. This approach is divided into three successive sceneries of STEP-NC deployment for progressive improvements. Industrial concerns can also use STEP-compliant applications with their current machining equipment. In the second part of the …