Abstract

In “The Ascription of Responsibilities and Rights,” H. L. A. Hart introduces two ideas, which he takes to be importantly related: ascriptive sentences and defeasible concepts. Hart's purpose is to dispel certain confusions that he nds in the philosophy of action; but I argue that Hart's ideas are equally pertinent to epistemology. Knowledge is a matter of epistemic authority; and authority is a matter of rights and responsibilities. But Hart's “ascriptivism” has attracted serious criticism and stands in need of clarification, elaboration and even correction. The overall aim of the paper is to present a form of epistemic ascriptivism, in which justification emerges as a defeasible concept in Hart's sense