As you've noted, Virginia, it's pretty much a matter of author choice, there are no hard and fast rules for it.
Most authors, I think, go for Michael's numbering system. I probably would do it that way, too, if I was still posting.
LabRat
Athos: If you'd told us what you were doing, we might have been able to plan this properly. Aramis: Yes, sorry. Athos: No, no, by all means, let's keep things suicidal.