 Fundamental to Rand’s outlook—so fundamental that she derives the name of her philosophical system, “Objectivism”, from it—is a trichotomy among three categories: the intrinsic, the subjective, and the objective (ITOE: 52–54; Rand 1965: 13–23). An intrinsic phenomenon is one whose nature depends wholly on factors external to the mind; a subjective phenomenon is one whose nature depends wholly on the mind; and an objective phenomenon is defined, variously, as that which depends on the relation between a living entity’s nature (including the nature of its mind) and its environment, or as that which depends on the relation between a properly functioning (rational) mind and extramental reality. Commentators are divided over the best way to interpret Rand’s views on this issue.