Full Idea
Inductive logicians have a 'requirement of total evidence': induction is strong if 1) it has true premises, 2) it has correct inductive form, and 3) no additional evidence that would change the degree of support is available at the time.
Gist of Idea
Good induction needs 'total evidence' - the absence at the time of any undermining evidence
Source
Wesley Salmon (Four Decades of Scientific Explanation [1989], 2.4.2)
Book Reference
Salmon,Wesley C.: 'Four Decades of Scientific Explanation', ed/tr. Humphreys,Paul [Pittsburgh 2006], p.55
A Reaction
The evidence might be very close at hand, but not quite 'available' to the person doing the induction.