The invention relates to methods and machine tools for processing workpieces, in which a workpiece and one or more processing tools are moved relative to each other with a positioning movement, an outward-stroke movement, and a return-stroke movement. Carrier quality measurements are taken in which carrier quality is a function of interference and multi-path fading and carrier-signal strength. In one example embodiment, the token instance of interest is a token instance for which attention level of the user is higher than at least one other token instance.