Lisi Aerospace manufacturers extremely high quality 'fasteners' that are used to crit- ical applications such as structural components of airplanes and rockets. Their quality manager, Andre, is investigating whether their 18mm diameter fastener is delivering a suitable level of quality. The customer requires that the diameter of this fastener is within the range 17.99mm to 18.02mm. After an extensive investigation, Andre finds that standard deviation of bold diameters is 0.0045mm. (a). Is this process Six Sigma