Continuity Issues

Let’s say you’re going to make up a story. A grand story. A story that’s going to span centuries with a cast of characters that numbers into the thousands. This story is going to be so big, that it’ll require several authors working with you – dozens in fact. And it’s going to take a long time to write. Generations will pass before it’s done. How are you going to plan for that?

I’m currently editing a novella collection about three brothers, but it’s on a much smaller scale. The stories are a...