 Today there are entire academic industries devoted to various aspects of the topic of scientific revolutions, whether political or scientific, yet we have no adequate general theory or model of revolutions in either sphere. This article will focus on Thomas Kuhn’s conception of scientific revolutions, which relies partly on analogies to political revolution and to religious conversion. Kuhn’s is by far the most discussed account of scientific revolutions and did much to reshape the field of philosophy of science, given his controversial claims about incommensurability, rationality, objectivity, progress, and realism. For a general account of Kuhn’s work, see the entry on  Kuhn.  See also Hoyningen-Huene (1993), and Bird (2001).