A renewed search for legal certainty is a reaction to the preponderance of judge made law, which has been in turn prompted by the democratic deficit of the EU and the impact of Anglo-American law. The problem is that the search is oblivious to both systematic interpretation and the need of re-systematization of law. The paper defines systematic interpretation, relates the definition to standard French and German conceptions, indicates the room for systematic interpretation in Anglo-American laws, and states prima facie (...) reasons for a re-systematization of law as a prerequisite of systematic interpretation. The problem cannot be appreciated outside its proper context. It is a disregard for causation and evaluation. Hence the paper outlines Aristotle’s understanding of causation and evaluation in his presentation of phronesis, reconsiders continental European legal thought in the light of Aristotle’s presentation, and offers policy-oriented jurisprudence as a remedy to the deficit of evaluation and causation in European legal thought. A solution to the problem offers a typology of criteria and clarifies positive and fundamental legal concepts, positive and fundamental criteria of systematization, and the place of criteria in knowledge of law. The usefulness of the criteria is demonstrated by a common approach to the systematization of law and an alternative diagnosis of a defect of systematization diagnosed by an authority in history and philosophy of law rather than legal theory. (shrink)