A wizard is a mythical character who can change the future, usually for a fee, provided he is given a well-defined request (one that passes the clarity test). The concept of the wizard is useful in decision analysis for assessing deterministic preferences by eliminating the complexity added by uncertainty. Calling on the wizard in a meaningful manner is subject to important restrictions (about the nature of free will and the meaning of counterfactual statements).

See also: Assessment, Clairvoyant, Context, Outcome and Value of Control.