flichik
You need to do some research on PPRuNe - search for "NAS" titles over at least the past year, grab a coffee and have a read.
This one is probably a good place to start - it's the thread involving a one-on-one debate between
Voices of Reason and Dick. Take the time to do the research.
This "debate" isn't a new thing - it's been going on here for at least the last two years.
I can assure you Shirl is well versed on the NAS debate in PPRuNe!
Woomera