HOW DO COMMERCIAL DEVELOPERS DESIGN RPGS?

I saw on RPS that they released parts of the original Bioshock pitch. It's a pitch though so it's not actual design doc stuff but still.

And checking the comments thread in RPS there's also a Grim Fandango design doc.

Alright so these are not RPGs are they? Well... Bioshock had plenty of "RPG Elements" and Grim Fandango is an adventure game and jRPGs are just adventure games with battles. So I'm guessing some of this can be useful. (I haven't yet read either of the docs though)

Oh and the Fallout Bible is probably also sort of kinda related. (Though it's all setting information)