Empiricist philosophy of science of the kind that promised truth through method and a unification of science now lies in disarray. Arguments over the indeterminancy of theoretical language, the inadequacy of induction, the empirical incommensurability of competing theories, the possibility or im- possibility of scientific progress, and the applicability of natural science metatheory and methods to problems of human action have allIed to a loss in confidence. As it is commonly said, the philosophy of science is now in a "postempiricist" phase. It is a phase marked by heated disagreement over...