A legal theory, any legal theory, necessarily adopts one of two perspectives or vantages or points-of-view. The author of a legal theory may take up the internal, engaged vantage or the external, detached vantage. If he seeks to explore, say, how judges should decide hard cases then his theory, explicitly or implicitly, will adopt an internal participant’s perspective. Most likely, he will be putting himself in the shoes of the judge (or alternatively, asserting that we are all judges of a sort) in order to convince others of how best this role can be performed. Less likely, will be he who is a revolutionary and who thinks that the judge should decide cases in such a way as to contribute to the subversion of the legal system. In either event, both will be prescribing. Prescription, answering the ‘ought’ and the ‘should’, presupposes an involvement in the question and a concern with some evaluative dispute (though the revolutionary clearly does not accept the norms of his legal system as binding).