fallibilism the doctrine, relative to some significant class of beliefs or propositions, that they are inherently uncertain and possibly mistaken. The most extreme form of the doctrine attributes uncertainty to every belief; more restricted forms attribute it to all empirical beliefs or to beliefs concerning the past, the future, other minds, or the external world. Most contemporary philosophers reject the doctrine in its extreme form, holding that beliefs about such things as elementary logical principles and the character of one’s current feelings cannot possibly be mistaken. Philosophers who reject fallibilism in some form generally insist that certain beliefs are analytically true, self-evident, or intuitively obvious. These means of supporting the infallibility of some beliefs are now generally discredited. W. V. Quine has cast serious doubt on the very notion of analytic truth, and the appeal to self-evidence or intuitive obviousness is open to the charge that those who officially accept it do not always agree on what is thus evident or obvious (there is no objective way of identifying it), and that beliefs said to be self-evident have sometimes been proved false, the causal principle and the axiom of abstraction (in set theory) being striking examples. In addition to emphasizing the evolution of logical and mathematical principles, fallibilists have supported their position mainly by arguing that the existence and nature of mind-independent objects can legitimately be ascertained only be experimental methods and that such methods can yield conclusions that are, at best, probable rather than certain. B.A.