The community of administrative law teachers and scholars seems to be in perpetual doubt over how administrative law should be approached as a branch of legal doctrine, and, indeed, whether the subject exists at all. At its core, administrative law is a collection of abstract, even pithy, principles that purport to describe and predict the bases on which judges review agency action. For example, agency decisions are to be supported by substantial evidence or are not to be abitrary and capricious and are to have a reasonable basis in law ; agencies must accord due process when they inflict deprivations of life, liberty, or property, and so on. Any experienced lawyer knows, however, that the actual content of these principles canno...