Not bad. But who decides if one of those things has changed? 

It’s also an incomplete definition for games built on scenes, like say Fiasco or any of the other GM-less storygame things out there. Some of them have much more rigorous definitions, requirements, procedures.

I mean it all works out obviously. Scenes work! But I think they work because there’s this cloud of unexamined assumptions that have built up in our cultures of play.