 This argument rests on the ordinary and intuitive notion of completeness as not omitting relevant truths. Thus, in the argument, the description given by the state function of a system is judged incomplete when it fails to attribute a position to the system in circumstances where the system indeed has a position. Although this simple argument concentrates on what Einstein saw as the essentials, stripping away most technical details and distractions, he frequently used another argument involving more than one quantity. (It is actually buried in the EPR paper, p. 779, and a version also occurs in the June 19, 1935 letter to Schrödinger. Harrigan and Spekkens, 2010 suggest reasons for preferring a many-variables argument.) This second argument focuses clearly on the interpretation of quantum state functions in terms of “real states” of a system, and not on any issues about simultaneous values (real or not) for complementary quantities. It goes like this.