Originally Posted by Mister Geezer
The weakest link is not the airspace infrastructure nor the ATS provider but rather the crews.
I heard once that the largest department at the ATS provider is 'Human Factors'. Why? Because the risks associated with inviting the lowest common denominator of your weakest link into their world have to be managed and minimised or in some troublesome scenarios zero-ed out by design (by the ATS provider).