 Hempel considered weakening condition  (CA-4)  to one of high confirmation instead of truth, but concluded that it would be awkward to have “adequate explanations” that are later superseded by different “adequate explanations” with the acquisition of additional evidence and alternative hypotheses across time. He therefore retained the condition of truth. Whether or not the conditions of explanatory adequacy should be relative to an epistemic context of confirmation rather than to an ontic context of truth would become an important question in coping with the requirements for probabilistic explanations.