 Strong “abductive” arguments are convincing instances of “inference to the best explanation” (see Harman 1965). They recognize some facts, point out that they are entailed by some hypothesis, and conclude that the hypothesis is true. Taken at face value, abductive arguments appear to be instances of the deductive fallacy “affirming the consequent,” but play an important role to play in medical, scientific and legal inquiry (see Walton 2004).