 However, it is easily seen that this is not a plausible proposal. Consider the following two cases. Case 1: Two witnesses point out the same person as the perpetrator, John, say. Case 2: One witness states that John or James did it, and the other witness that John or Mary did it. Since the joint probability is the same in both cases, equaling the probability that John did it, they yield the same degree of coherence as measured by \(C_0\). And yet, the reports in the first case are more coherent from a presystematic standpoint because the witnesses are in complete agreement.