Casuistry
（重定向自Casuistical）
Casuistry (), or case-based reasoning, is a method in applied ethics and jurisprudence, often characterised as a critique of principle- or rule-based reasoning. The word "casuistry" is derived from the Latin casus (meaning "case").
Casuistry is reasoning used to resolve moral problems by extracting or extending theoretical rules from particular instances and applying these rules to new instances. The term is also commonly used as a pejorative to criticize the use of clever but unsound reasoning (alleging implicitly the inconsistent—or outright specious—misapplication of rule to instance), especially in relation to moral questions (see sophistry).