 Some arguments are such that the (joint) truth of the premises is necessarily sufficient for the truth of the conclusions. In the sense of logical consequence central to the current tradition, such “necessary sufficiency” distinguishes deductive validity from inductive validity. In inductively valid arguments, the (joint) truth of the premises is very likely (but not necessarily) sufficient for the truth of the conclusion. An inductively valid argument is such that, as it is often put, its premises make its conclusion more likely or more reasonable (even though the conclusion may well be untrue given the joint truth of the premises). The argument