I see it like a combination of the 90-90 rule with Zeno's paradox of the arrow. > The first 90 percent of the code accounts for the first 90 percent of the dev

I see it like a combination of the 90-90 rule with Zeno's paradox of the arrow. > The first 90 percent of the code accounts for the first 90 percent of the development time. The remaining 10 percent of the code accounts for the other 90 percent of the development time. This rule applies to that remaining 10% as well, so the work can theoretically continue forever trying to reach 100% done.