To clearly grasp the importance of science, we need to startacknowledging the value of knowledge as constituted by twocriteria: its utility and its reliability. However, there are questionsconcerning the interpretation of both notions. Fortunately, theproblem is solvable. The meaning of utility becomes clear whenwe distinguish between two possible forms of utility: expected andachieved utilities. The meaning of reliability becomes clear whenwe recognize which form of reliability is the one that is trulyachievable.
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