 Laws of one kind may apply nicely to systems, phenomena or events purely of one kind, but such things are not concrete individuals in the real world. We may think of them as useful models or abstractions; reality behaves more like them only in controlled settings, the outcome of engineering, of planned design and construction, that is, the materialized form of abstraction. Idealizations, like ideal types, dangerously assume real separability between properties (Neurath 1941/1983, 225). In this sense, necessary experimentation for the purpose of prediction and testing that control is key to observation and in turn observation controls theory. In general, from that point of view, exactness and scope requires the possibility of composing models, laws and sciences of different kinds. Science at the point of action is unified science.