 This argument relies on the assumption that there is no set of rules that describes what a person ought to do in every possible set of circumstances, and on the further assumption that there is a set of rules that describes what a machine will do in every possible set of circumstances. From these two assumptions, it is supposed to follow—somehow!—that people are not machines. As Turing notes, there is some slippage between “ought” and “will” in this formulation of the argument. However, once we make the appropriate adjustments, it is not clear that an obvious difference between people and digital computers emerges.