ARGUMENT by analogy is one of the oldest methods of decision making. Whenever the similarity between two situations induces someone to decide one case like another, an analogy is drawn. Argument by analogy also forms an integral part of legal reasoning. Arguably, every legal tradition employs some version of it to justify judicial decisions. European law has only just started to develop its own distinct jurisprudence. As the various judicial systems present in the European Union struggle for recognition of their legal heritage, the way in which arguments by analogy will be used on an European level is likely to combine different approaches.