 Joseph Ford offers a different construal of the correspondence principle: “any two valid physical theories which have an overlap in their domains of validity must, to relevant accuracy, yield the same predictions for physical observations.” In the case of quantum and Newtonian mechanics, this means that “quantum mechanics must, in general agree with the predictions of Newtonian mechanics when the systems under study are macroscopic” (1992, p. 1087). Unfortunately, he gives no discussion of what “domains of validity” mean or in what sense quantum and Newtonian mechanics have some overlap in their domains of validity. What he claims in his American Journal of Physics article is that “The very essence of correspondence lies in the notion that quantum mechanics can describe events in the macroscopic world without any limit taking. Were this not the case, then there would be no overlap in the quantal and classical regions of validity” (1992, p. 1088). Sir Michael Berry is even more direct: “all systems,” even our orbiting moon, “obey the laws of quantum mechanics” (Berry 2001, p. 42). The upshot for chaos is that “if there is chaos (however defined) in the macroscopic world, quantum mechanics must also exhibit precisely the same chaos, else quantum mechanics is not as general a theory as popularly supposed” (Ford 1992, p. 1088). 