Sunfish
Please accept my humble apologies for it seems, attempting to teach you to suck eggs in relation to DNV type metrics as it appears you are well aquainted with the concept.
You have hit the nail on the very head of the issue.
If you had been around and forgive me if you have, since about Day 1, that has been the
very nub of the issue, with the lack of any formal analysis in its implementation beyond being defended on " it works there, so it must work here" and "I believes" by the proponents.
The independently produced to protect their corporate backsides, as they should, Broome DAS was the seminal document.
It is a long time since I did serious stats and I am aware of the work by Feynman, thank you I will go and have another read.
His closing sentence indeed should be tattooed on the forehead of all who in these fields.
BTW I do not nor ever have worked as an ATC for Airservices.
