Summary: It is commonly assumed that deontic logic concerns “the” logic of normative concepts. However, a close look at actual usage shows that the structural patterns of deontic notions differ between different usages. Some of these differences are difficult to discern in natural language, but may be easier to keep apart with the more precise tools of a formal language. We should use the resources of deontic logic to discover and distinguish between different meanings of the deontic terms in natural language. Some of the ingrained disagreements on postulates in deontic logic may be resolvable if we recognize that the different viewpoints correspond to different meanings of the normative terms of ordinary language.
For the entire collection see [Zbl 1293.03004].