I adopted the D'Aboville (descending) system for my genealogy records and the system works okay for me. But it does cause me to wonder what will happen to all of this documentation if and when an ancestor is discovered who lived earlier than my currently known earliest ancestor. That is the objective, after all.
I am wondering what to do when additions are made to a generational numbering system based on (starting with) the earliest known ancestor, when even earlier generations are discovered.
I know I could simply adopt an ascending system, but that would only guarantee that my data would all be obsolete in less than one full generation, as children do seem to keep coming along.