Recent developments in economics and the science of law emphasize their cooperation for a better understanding of social structures and interactions, an effective application of social scientific knowledge and a rational evaluation and implementation of social norms. There are, however, difficult methodological problems in this endeavor: Whereas economics is mainly (with the exception of welfare economics) an empirical science which collects information about economic activities and the functioning of the economic system, the science of law is a normative discipline aiming (...) at solving social conflicts and establishing rational principles for judicial decisions. In this paper, we suggest a three-level scheme for the interdisciplinary cooperation of law and economics, addressing the different problems that positive and normative economics face as they apply economic knowledge to legal matters. Economic analysis of law is proposed as a model for a general transformation of the traditionally hermeneutical jurisprudence into an analytic-normative science of law based on theoretical expectation (explanation) and the rational evaluation of the consequences of legal rules and principles. (shrink)