 The literature surrounding EPR contains yet another version of the argument, a popular version that—unlike any of Einstein’s—features the  Criterion of Reality.  Assume again an interaction between our two systems linking their positions and their linear momenta and suppose that the systems are far apart. If we measure the position of Albert’s system, we can infer that Niels’ system has a corresponding position. We can also predict it with certainty, given the result of the position measurement of Albert’s system. Hence, in this version, the Criterion of Reality is taken to imply that the position of Niels’ system constitutes an element of reality. Similarly, if we measure the momentum of Albert’s system, we can conclude that the momentum of Niels’ system is an element of reality. The argument now concludes that since we can choose freely to measure either position or momentum, it “follows” that both must be elements of reality simultaneously.