There's a whole bunch of reading you could do on "man rating" of rocket boosters. Nothing SpaceX does is unique in this area (except reusing some of the booster

There's a whole bunch of reading you could do on "man rating" of rocket boosters. Nothing SpaceX does is unique in this area (except reusing some of the boosters). I mean, more testing, more QC, more caution and less pushing of limits, etc. I don't think it's something where you'll find a really clear, single answer about specific changes that need to be done to rate a spacecraft. [0] Russia's Soyuz-U has a long history as a reliable booster. They flew it for over four decades, and some blew up, but they never lost a crew. (They did send one crew downrange on a ballistic flight path after a safe abort, which I bet was exciting for everyone concerned [1]) [0] https://en.wikipedia.org/wiki/Human-rating_certification https://en.wikipedia.org/wiki/Human-rating_certification [1] https://en.wikipedia.org/wiki/Soyuz_MS-10 https://en.wikipedia.org/wiki/Soyuz_MS-10