Vincent Baker
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Vincent Baker is the designer of the roleplaying games Dogs in the Vineyard, kill puppies for satan, Otherkind, and others. His publishing imprint is called Lumpley Games.
He is attributed as formulating the Lumpley Principle which states "System (including but not limited to 'the rules') is defined as the means by which the group agrees to imagined events during play." Further development of the Lumpley Principle described player contributions as being assigned credibility by the other players in the game.