Well, “robust” is defined by professional judgment and experience. Two weeks ago, I would have given you a different answer from what I'm giving you today. Today I would say I'm not so sure that blowout preventers can be relied upon the way they've been designed to date.
That's why a goal-oriented regulation is far superior to a prescriptive one, because a prescriptive regulation would have said a blowout preventer should look like this. It should have the following features. It should be that big or that small. I exaggerate, of course, but a prescriptive regulation stipulates a given solution, a preconceived solution.
With what we will learn from the gulf, we will have to reassess everything we've assumed in terms of what makes an operation like that safe and environmentally sound.