 As we have seen, Bell’s investigations were stimulated, in part, by the question of the prospects for theories in which the complete state uniquely determines the outcome of any experiment, and quantum uncertainty relations reflect incompleteness of the usual specification of state. For such a theory, the response probabilities \(p_{ab}(s,t|\lambda)\) take on the extremal values 0 or 1. Let us call this condition OD, for outcome determinism. It is also sometimes referred to, misleadingly, as realism (see discussion in  section 3.3,  below).