Abstract

According tothe rationality thesis, the possession of propositional attitudes is inextricably tied to rationality. How in this context should we conceive of rationality? In one sense, being rational is contrasted with being non-rational, as when human beings are described as rational animals. In another sense, being rational is contrasted with being irrational. I shall call rationality in this latter senseevaluative rationality. Whatever else it might involve, evaluative rationality surely has to do with satisfying requirements of rationality such as, presumably, the following:(1) That one avoid inconsistency in beliefs.(2) That one not adopt new beliefs unless what one knows entails or is evidence for the truth of those beliefs.(3) That one not have φing as a goal yet do nothing necessary for one to φ. (Means/end requirement.)