 The usual way to achieve this is to continue existing yourself, but the fission story shows that this is not necessary. Likewise, even the most selfish person has a reason to care about the welfare of the beings who would result from her undergoing fission, even if, as the non-branching view implies, neither would be her. In the fission case, the sorts of practical concerns you ordinarily have for yourself apply to someone other than you. This suggests more generally that facts about who is who have no practical importance. All that matters practically is who is psychologically continuous with whom. (Lewis 1976 and Parfit 1976 debate whether the multiple-occupancy view can preserve the conviction that identity is what matters practically.)