Abstract: The standard representation of beliefs in decision theory and much of formal epistemology, by probability measures, is incapable of representing an agent's confidence in his beliefs. However, as shall be argued in this talk, the agent's confidence in his beliefs plays, and should play, a central role in many of the most difficult decisions which we find ourselves faced with. The aim of this talk is to formulate a representation of agents' doxastic states and a (axiomatically grounded) theory of decision which recognises and incorporates confidence in belief. Time-permitting, consequences for decision in the face of radical uncertainty will be examined.