 The methodological simplicity mentioned in this passage was suggested to Salmon by John Clendinnen. It is a version of simplicity that applies to rules instead of statements, and requires the adoption of “the simplest system of predicting rules which are compatible with, and exemplified in, the set of known facts” (Clendinnen 1982: 20). Salmon accepted Clendinnen’s suggestion as a significant, if not decisive, contribution to the justification of induction (Salmon 1982c and 1991).