"to make sure we all agree"
No, thanks. I don't like communism. ;-)
Seriously: Replace "NATO mission" with the "Western efforts in Afghanistan" and then ask you yourself if an international Afghanistan study group is needed to improve the current state of affairs in Afghanistan. See the poll.
But seriously, are there any examples in the past of a study group, international or otherwise, coming up with a solution that worked for an insurgency of this sort (other than "get the hell out of there"). If not, what reason is there for expecting that it would be any difference in Afghanistan?