I think in something like this, there are always degrees of certainty. It's important to prepare the numbers based on the best information that is available, including all of the information that is known at that point in time.
Certainly, as you move through a project like this and as you get closer to the end, the estimates can be more and more precise. But even still, even in early phases, as we indicated, in this instance there were some specific types of cost elements that we felt should have been included because they should have been predicted.
So certainly over time these types of estimates can be more precise, but that doesn't mean that the original cost estimates should not include all of the cost elements.