 What is the relation between a theory of scientific rationality and a general methodology of science? Like the Popperians from which he diverged, Lakatos held that methodologies are theories of scientific rationality (Curtis 1986). Similarly, a metamethodology (tasked with determining which methodology outperforms others) is identical with a metatheory of scientific rationality. Lakatos’s metatheory recapitulates MSRP at the metalevel. According to Lakatos, his meta-MSRP shows that MSRP defeats competing methodologies, because it provides the best fit with the history of science in the sense that it renders the history of science maximally rational. That is, MSRP makes rational sense of both the intuitively rational episodes and some that its competitors have to exclude as externally caused deviations from the rational ideal. Indeed, it predicts that some counterintuitive cases will be seen to be rational when examined closely.