Well, I just realised that I may have missed the 10-year anniversary of the HEXAD!!
I think I actually created the HEXAD in 2013 – but it is a bit fluffy as it went through so many iterations before the HEXAD was finalised! Below you can see some of the evolution. There was much more than this of course.
One of the things building this taught me was that you are not always right! I too many missteps and had a lot of help. Richard Bartle, Amy Jo Kim and Nicole Lazaro all gave me loads and loads of help as I developed the types.