FYI that's what "abduction" means – whatever is needed to fill in the gaps that induction and deduction don't cover. it's rather vague and poorly specified though. it's supposed to be some sort of inference to good explanations (mirror induction's inference to generalizations of data), but it's unclear on how you do it. you may be interested in reading about it.

in practice, abduction or not, what they do is use common sense, philosophical tradition, intuition, whatever they picked up from their culture, and bias instead of actually having a well-... (read more)