Unfortunately the only “real world” examples I can personally think of for craft guilds are from more than a century ago, making them quite poor examples of the

Unfortunately the only “real world” examples I can personally think of for craft guilds are from more than a century ago, making them quite poor examples of the practice in a modern context. However if your not opposed to a little bit of history, I’d recommend checking out the history of craft guilds which goes back well over a millennium and it represents one of the earliest forms of “qualification” outside of religious or spiritual contexts (since determining if you have a suitable priest of Zeus, etc… has basically been a thing since forever)