 Demonstrating that an adequate scientific explanation is at hand, however, imposes demands beyond the acquisition of information about initial conditions and laws. In the examiner’s sense of knowledge Ian Hacking identified (Hacking 1967: 319), to prove an adequate scientific explanation is available, it would be necessary to show that each of Hempel’s adequacy conditions has been satisfied. It would not be enough to show, say, that one person is knowledgeable about the initial conditions, another about the covering laws, and a third about the explanandum. It would be necessary to show that the explanandum can be derived from the explanans, that those laws were required for the derivation, and that the initial conditions were those present on that occasion.  (CA-1)–(CA-4)  qualifies as a “check list” to insure that a scientific explanation is adequate.