Again, the Auditor General has done an extensive review of the implementation of safety management systems and Transport Canada's oversight of SMS in railways.
I'd like to add that every safety management system must have certain basic principles. They are specified in slightly different ways, depending on the mode of transportation. Air is a little different from rail, a little different from marine, but they're all based on the same principles.
I think what we've seen in our investigations is it isn't always easy to foresee the combination of circumstances that can lead to an accident, because there's always more than one, as we saw in the release of our report last week on the First Air accident. It has to mature over time as people gain experience, but that's why it's very important to have effective oversight.