When an incident or accident is investigated, the investigators have tools developed by the TSB to find or distinguish facts related to either the reasons for or the risk associated with fatigue. First, the investigators look at the past 72 hours, as Ms. Fox mentioned. After, if they have indications, they'll use these tools to look more specifically at different areas, such as whether the ocean was crossed the right way or the wrong way or whether the flight came from Europe. At the TSB, we also have human factor specialists.
If fatigue is identified by the investigators' tools, we conduct a more in-depth study using our specialists' report on the human factors. This gives us a good sense of the direction to take the final report, but it's also useful in terms of the data, because we keep all the data. Whenever we identify a fact that may be related to fatigue, we keep the fact in mind.