Chisholm’s remarks strongly suggest that he takes these questions to indicate that there is something deeply problematic about the notion that the same individual can exist in different worlds with different qualitative properties. Once we accept this notion, we seem to be on a path that will eventually lead us to the conclusion that there are indefinitely many worlds each of which is qualitatively indiscernible from the real world, but differing from it only in the identities of the individuals playing the various roles. Such a plurality of worlds seems undetectable and pointless.