If I could just make one quick point, the bet that's made when we finally go to Parliament for appropriating money is a bet that's supported by the Department of Finance and by Treasury Board, which actually believe that basically we have it right. As you can imagine and as I think you would know from your time, those are pretty rigorous challenge functions. We don't just put up our own estimates without them being unchallenged.
So in some ways there is an asymmetry here, but now I'll let Dan speak to that question.