One of our customers did us the honor of declaring us to be a critical supplier. The reward is a 30-page quality audit checklist and a multi-day on-site audit of our quality systems.
Most of the stuff on the checklist we don't even understand. Heck, we usually don't even understand the syntax, much less the meaning.
Like, we are supposed to have a PFMEA process procedure. So I looked it up...
This is one of over 200 requirements.