I will attempt to give you an example of how this is expected to work for most operations. This is an example, it is only an example, it should not be taken literally as an exact comparison.
If one owns a machine shop (one of many possible examples), the shop typically requires operators, setup personnel, leads, and foremen to have or be able to use equipment to check spec requirements. The equipment used by these people may or may not be the same used by the quality control staff. However, this type of quick check rapidly isolates a problem so out of spec products do not enter the production stream.
I must assume your question was not serious, because most people with a production, manufacturing, quality control, or technical background would know the above example. However, if you were being serious, I hope you will find this example helpful.
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