摘要：At first sight, law and improvisation do not appear to have much in common. Law is (or at least aims to be) the realm of rules and certainty, while improvisation is the realm of unheard sounds and unpredictable patterns. Law allows room for interpretation, but does it allow room for improvisation? The precautionary principle shapes a prospective form of legal responsibility rather than the traditional retrospective one, designing a responsibility in exercise, which can be included in Herbert Hart's category of “role-responsibility.” Improvisation can be taken as a paradigm explaining the ways in which precaution operates, adding a new dimension to our comprehension of responsibility.
