 (7) We should seek neither a single, neutral method of all science at all times nor an account based on explicit methodological rules. Most normal scientific decisions are based on skilled judgments, not rules (Kuhn [1962] 1970a: chs. 5, 10). The appearance of rules in scientific practice is a sign of crisis, of breakdown. Contrary to tradition, neither rationality within a paradigm nor rational choice between paradigms is a matter of following rules. It is not the application of a formal, logic- or probability-based algorithm. In both cases it is a matter of skilled judgment (of different kinds).