 Because the idea of comparison is closely tied to the topic of value incommensurability, this has led to use of the term “incomparable” alongside “incommensurable” in the literature. Some authors use the terms interchangeably (e.g., Raz 1986). Others use them to refer to distinct concepts (e.g., Chang 1997b). This entry will use the term “incomparable” to refer to the possibility that no positive value relation holds between two value bearers (Chang 1997b). Positive value relations specify how two items compare (e.g., “better than”) rather than how two items do not compare (e.g., “not better than”).