 In the case of inference validity, this expansion has been accomplished by treating deductive validity as one variant of validity, and by recognizing other “defeasible,” non-deductive ways in which premises may entail conclusions. Govier 1987 dubs the deductive/inductive distinction as “the great divide,” emphasizing the latter over the former. Sometimes informal logic systems understand inductive arguments narrowly, as inductive generalizations. Sometimes more broadly, as arguments which have premises that imply that a conclusion is (only) probable or plausible, leaving open the possibility that it is false. 