 Following Bishop Butler [see  Section 5],  Roderick Chisholm distinguishes between a strict and a loose sense of identity (see Chisholm 1969a). To see what this distinction comes to, and how it might help with the puzzle cases, consider the case of Cup and Tcup. For Chisholm things have their parts essentially in the following sense. It is impossible for a to be identical with b in the strict and philosophical sense, unless a and b have all their parts in common. Earlier Cup has a part, a handle, that later Cup, not to say earlier and later Tcup, lacks. Hence, on Chisholm's view, earlier Cup is not strictly identical with later Cup.