Another excellent article I just want to quickly point out to you guys: It’s a short piece by the MTV Multiplayer blog about the design process behind the Shadow Complex world.
It basically boils down to the Chair Entertainment guys prototyping the entire game world on paper and playing through it. Accoding to the article this method helped identify and prevent at least a few issues that might otherwise have ended up in the final game. That just goes to show that there’s a lot of trouble you can avoid if you building a good prototype.