In the lead article in this symposium issue, Edward Imwinkelried follows other scholars in distinguishing among three types of tasks for ethicists serving as expert witnesses: descriptive ; metaethical ; and normative. He finds agreement that the admissibility of descriptive or metaethical evidence rests upon the usual criteria of helpfulness and reliability. He breaks new ground in arguing that normative evidence typically relates to the judge's legislative rather than adjudicative function and therefore need not satisfy the usual standards for admissibility (...) in order to be considered. (shrink)