Imaging errors introduced by lenses can limit the quality of an optical system. Both distortion and perspective errors, however, can be measured and corrected.
Your siren's call for the silent majority of ISO 9000 supporters to speak out has gripped my fingers with a compulsion to write my first letter to a trade magazine.
Surface analysis is a key specification, but one, at least according to some members of a surface texture standards committee, that not enough engineers knows enough about.
I believe that our company is part of a very small minority of registered companies that has benefited from an ISO 9000 registration -- but it certainly was not easy or without high cost.
A working knowledge of geometric dimensioning and tolerancing (GD&T) is necessary if engineers want to truly understand the designer's intent, and therefore plan accurate and appropriate inspection of the product the drawing represents.