I hear some assessors are saying on their mettle that they will go to a floor site and ask or observe personnel to determine as for his or her competence and awareness for his or her jobs.
The way of this assessment is totally nonsense!

If a patrol officer sees a driver, generally he or she may ask the driver to show his driving license. The officer who has common sense, will not require for the driver to do parallel parking or drive on an s-shape road for confirming his competence of driving, because the license shows the driver is competent.
In order to get the license, the driver was required to do parallel parking, etc, in a driving school and formal inspectors of the school observed his driving to determine his competence for driving. Generally a patrol officer has not competency for testing drivers' skill as formal inspectors have.

Likewise, an assessor of quality management system has not competency to measure or determine personnel competency for a specific job of a company. Only experts of the company have its competency.

Main thing to do for an assessor is to require showing training records, like a patrol officer who has common sense.
By oral assessments, eloquent personnel may satisfy the assessor. But it only measures the degree of eloquence. Some say that generally an inarticulate person does his job well.

Ironically such oral assessments will lead to increased skill how to answer well, not to do jobs well. Thus forgetting true quality!