u/AeroSubwayTerminal

I'm doing research on plurality and stances, and some people say that the term "system" originated from DID + OSDD, while others say it existed before DID and OSDD were popularized. People say that the term was stolen from either side, and I'm really just looking for sources on where it came from. I don't want to support people if they are using terms that were specifically tailored for people with disorders, but I can't make that judgement unless I have proof that's really where it came from.