I could try, and then I think DND could speak to the rest.
For us, one of the first things was the fact that the original estimate was based on outdated information. As I mentioned, there were cost estimates for the aircraft themselves that were more up to date and could have been used that came out of the joint strike fighter program office. They could have started with that.
There are elements that, in our view, were missing from the full costing of the project. As I mentioned earlier, DND manages its projects slightly differently. Some of the power grid upgrades and infrastructure needs that were put into another project should, I think, have been thought about here.
Then there were the delays. Any time you delay something, costs have the potential to increase. In this case, needing temporary infrastructure for maintenance and for training was driving up the costs that weren't planned at the beginning.