How Do We Know When We're Done?

We don't.

Like Disneyland, the Artemis Project will never be finished. The skeleton scenario for the Artemis Project is something like:

1. Several very small robotic explorers, leading to . . .
2. First lunar exploration base (a small module), leading to . . .
3. Lunar exploration and site assays, in parallel with . . .
4. Lunar industrial process pilot plants, leading to . . .
5. Lunar industries expansion at the exploration base, leading to . . .
6. Exploration base expansion, leading to . . .
7. Subselene village, in parallel with . . .
8. Reduced-cost manned launchers, in parallel with . . .
9. Expansion of lunar fuels industry, leading to . . .
10. Lunar tourism, leading to . . .
11. Subselene city, in parallel with . . .
12. Farside scientific outposts, leading to . . .
13. Lunar surface transportation systems, leading to . . .
14. Self-sufficient lunar economy, and . . .
15. More cities, leading to . . .
16. Support to planetary exploration, leading to . . .
17. Human communities on Mars, and . . .
18. Asteroid mining, leading to . . .
19. Human communities in the asteroid belt, leading to . . .
20. Human communities among the outer planets, leading to . . .

    THE STARS!