If the problem of induction is not how to justify induction in the sense mentioned above, then what is it? It is helpful here to look at the case of deduction. Instances of deductive inferences are justified by showing that they are inferences in accordance with valid rules of inference. According to Goodman, the rules of logic are in turn valid because they are more or less in accordance with what we intuitively accept as instances of a valid deductive inference (FFF, 64).