As I mentioned in our discussion, triggering can occur in four different ways. There's a “federal coordination process”--I do put that in quotations--of federal agencies figuring out who needs to do an environmental assessment. That process takes two, three, four, sometimes five or six months, and even longer on larger projects.
A list-based approach, contrary to that, will be one where certain projects or projects with certain attributes would require an environmental assessment at a certain level. The whole administration of who should do the assessment and so on just wouldn't occur with a list-based approach, provided you also made amendments that look to centralizing the responsibility for decision-making around screenings as well, as we've done with comprehensive studies.
The fact that you have different actors is not a very efficient process.