Two allied methodologies need to be mentioned that arose along side of naturalized epistemology in the last century. Goodman introduced the concept of a reflective equilibrium in addressing the problem of justifying induction (Goodman 1955). Rules of inference would be formulated to explain what one takes to be valid scientific reasoning, much as one might formulate deductive inference rules to explain valid inferences of mathematicians. Application of these rules may, however, yield conclusions