[wolfram74]

Extra Credits did two videos on it as well, referring to it as Bartle's Taxonomy

intro: https://www.youtube.com/watch?v=yxpW2ltDNow how a mixed ecosystem impacts things: https://www.youtube.com/watch?v=1drDuaQXm_U

[mhuffman]

I was going to say that Bartle's taxonomy maps pretty closely to those, but it has a little more depth:

https://en.wikipedia.org/wiki/Bartle_taxonomy_of_player_type...