I'll just add a few points.
I was thinking of hiring you when I heard your question.
First of all, on technology, there are two points. We have depended largely, over the last 50 years, on technological improvements in aviation to improve our safety record. For instance, when the jet engine was brought in to replace the old propeller large aircraft, the accident rate was reduced significantly. What we find now is that we think we are almost at the end of the technological improvements. We need to focus far more on human factors, on the analysis of risk, and as you mentioned, on more proactive analysis of what could happen to prevent accidents rather than on why accidents have happened. This is really key in the implementation of SMS within industry.