In his Unified Theory of Thought, Meaning and Action, D. gave a double answer (negative and positive) to the question whether there could be a science of rationality (). In this paper we undertake an analysis of Davidson’s view with two goals in mind. First we want to spell out the clarification it brings to the current scientific study of rationality (). Second, we will argue that his view, starting from an attribution of rationality from above and from within, lacks the means to deal with the problems raised by irrational reasoning of agents. Here we refer to work by S. and Q. . We also relate Davidson’s proposal regarding rationality to the predicament W.V. posed for philosophy in suggesting that the mental should both be naturalized and a subject for interpretation.