Success was The Wørd for February 26, 2006. It was chosen in honor of the triumphant Bristish pull-out from Iraq which, as Vice President Dick Cheney has noted, is a clear sign of progress, no matter what any National Intelligence Estimates might otherwise suggest.
The NIE is just a set of facts. Mr. Cheney's opinion is based firmly in his gut directly below where his heart would be if he had one.
Any further definition of success would embolden the enemy.