I can, Mr. Chairman. I will start by telling you that the department's work is based on a bottom-up approach that works through all of the information that's developed by the joint project office and the joint estimating team in Washington. It's very detailed work. My colleague can speak to that issue.
This is our understanding of the Parliamentary Budget Officer's methodology. I would say the Parliamentary Budget Officer was handed a very difficult task, asked to do an independent assessment of the costs, which we took to mean independent of the work of the joint project office and independent of our own work. But he did the best he could. He took a top-down approach. He used what is called parametric analysis, generally deemed to be not appropriate or suitable for a project in this state of development.
I could ask the chief financial officer to elaborate a little bit on those methodologies, if you would like.