Before revision: Evidential decision theory is a school of thought within decision theory according to which the best action is the one which, conditional on one's having chosen it, gives one of the best expectations for the outcome .
After revision: Evidential decision theory is a school of thought within decision theory which states that, when a rational agent is confronted with a set of possible actions, one should select the action with the highest news value, that is, the action which would be indicative of the best (EDT)