Felt the need to post this as I’m always asked this question from people not in the industry. Luckily I don’t have to write a thing because my good friend Jameson Durall from Volition Games took time away from his busy schedule working on Red Faction: Armageddon to explain it.
Thanks Jameson!
http://jamesondurall.blogspot.com/2010/06/what-does-game-designer-actually-do.html