How many bubbles are permissible in a lens? Which striae quality is needed for a large precision prism? How do I specify the requirements in the right way to obtain just the quality that I need without paying unnecessary surcharges? How can I avoid errors leading to wrong deliveries, considerably longer delivery time or even total loss of delivery? The old wisdom of quality engineers is that more than 80 % of mistakes and errors come from communication issues. How can communication be improved? This can be done using well-defined terms and unique statements to product properties. It is the...