 Someone attributing such a belief cannot be responsible for the many modes of representation that the various believers associate with ‘Bob Smith’. It may seem that the theory could work in this case only if we could find a sense for ‘Bob Smith’ that does not vary from person to person and that can serve as the mode of presentation of that individual for each person. That seem unlikely. Let’s call this the problem of variability in sense. (See Richard 1988 for a development of the variability problem. See Forbes 1989, 1990 for an attempt to solve it.)