 It has become conventional to call an answer to Lukasiewicz’s problem a principle of unity, and an answer to Anscombe’s problem a principle of individuation. The traditional view has been that individuation is a metaphysical issue: what is it that makes one individual different from another (of the same kind)? However, some scholars have argued that Aristotle at no point addresses this issue, but is instead concerned with the epistemological question of how we tell one individual from another (see Charlton 1972).