If you were supervisor for a group that assembled tuning parts for cell phones and the quality was not what it should have been, and the parts are always being returned to be reworked, what staffing factors would be contributing to this problem?
Quality control is an essential component of any manufacturing process, and if substandard items are being repeatedly shipped to increasingly irate customers, then somebody is not doing his or her job. And, as supervisor, that person would be me. Depending upon the scale of the problem, including how long I knew there was a problem with the parts in question and failed to take actions to correct the flaw, my punishment could range from demotion to being fired. No company can survive if it is repeatedly shipping parts that do not meet the required specifications. In fact, such parts should never have left the factory floor in the first place.
Manufacturing parts, especially complex or intricate parts that fit into a larger electronic device, have to be molded to very precise specifications. The supervisor is responsible for ensuring that the machines being used are properly calibrated, and must do periodic inspections of parts to catch flaw as early in the process as possible. Time and materials spent manufacturing defective parts costs the company a lot of money. If the supervisor failed to identify the problem, and take corrective actions, he or she does not belong in that job. If the supervisor identified the problem, addressed the problem with the employee(s) in question, and the problem was still not fixed, then, at a minimum, the employee(s) is replaced. The bottom line, however, is that the supervisor should have caught and corrected the problem early.