Given the huge problems that an account of haecceities seems to raise, it is worth seeing just why Scotus believes he needs to accept this view of individuation as opposed to a rival one. Scotus defends haecceities by rejecting all alternative theories of individuation known to him. Rejecting qualitative theories is easy for the scholastics. Suppose that all things of a given kind in some sense share the same nature. The nature as such cannot explain individuation. So the explanation must be som