Stone cold, Apologies, yes I was a bit condescending I agree. Just when I see Wikipedia and Ueberlingen used to justify an argument I tend to get annoyed.
UEBERLINGEN was a total failure of nearly all the actors that day . So you can pick up an extract and use it to justify anything .Only if you follow the timeline and get the 13 consecutive failures that day you get to understand what Systemic failures are , and that night the system failed , Not an individual.
The Report quote you used in your reply is also biased because it refer to required separation ( 7NM instead or the normal 5 Nm because someone had turned off his main radar and he was working on the back up system ). The initial instruction given was more than enough to prevent a collision.
I send you a PM explaining the rest .
This is a little off topic