  The quantum realm as depicted by all the quantum theories that postulate non-locality, i.e., influences between distant (space-like separated) systems, involves some type of non-separability or holism. In what follows in this section, we shall consider the nature of the non-separability and holism manifested by various interpretations of quantum mechanics. On the basis of this consideration, we shall address the question of whether these interpretations predicate the existence of action at a distance.  We start with the so-called ‘collapse theories.’