 It is difficult to pin down the alleged problem that is supposed to be at the heart of this dispute. In particular, although the main proponents of the view that the alleged problem is a pseudo-problem clearly intended to attack (inter alia) Lewis’s version of modal realism, they did not attempt to rebut the thesis (discussed in Section 1.2 above) that if one is a Lewisian realist about possible worlds, then one should find transworld identity problematic. Matters are complicated by the fact that proponents of the view that the alleged problem of transworld identity is a pseudo-problem were to some extent responding to hypothetical arguments, rather than arguments presented in print by opponents (see Plantinga 1974, 93). However, one central issue was whether the claim that an individual exists in more than one possible world (and hence that there are cases of transworld identity) needs to be backed by the provision of criteria of transworld identity, and, if so, why.