Theseus Model Robustness

[RoryWatts]

Just noting an idea about model robustness, that would be good to formalise at some point.

• Rebuild the ship with all the same parts - does it hold up?
• Rebuild the ship, modify the assumptions?
• Replace parts of the ship
• Replace parts of the ship, modify the assumptions

If the ship can sail, it's Theseus robust

[RoryWatts]

This is probably a subset of the discussion #2