The aim of process engineering is to identify the least expensive production cycle to make a product. A sheet metal product follows a cycle that starts from raw material, goes through shearing (punching, blanking or laser cutting) followed by forming (bending, stretch-forming or embossing, rollforming). The cutting technologies by punching and stamping (fig. 1) will be taken into consideration in these pages due to their similarities. The purpose is to identify the technology from among those available that, in a specific working situation (number and type of parts to be manufactured) completes the production at least cost.