 To replace the covering law model's "inductive-statistical model" (IS model), Salmon introduced the "statistical-relevance model" (SR model), and proposed the criterion "strict maximal specificity" to supplement the covering law model's other component, the "deductive-nomological model" (DN model).Yet ultimately, Salmon held statistical models to be but early stages, and lawlike regularities to be insufficient, in scientific explanation.Salmon proposed that scientific explanation's manner is actually "causal/mechanical explanation".