From 1998 to 2001, in a column entitled "Ethical Challenges" edited by Michael Morris, the American Journal of Evaluation published 10 case descriptions of ethical problems in evaluation and 19 commentaries on them. These cases and commentaries provide a snapshot of ethical challenges encountered by practitioners, and recommendations by selected senior evaluators of professionally responsible ways to respond to them. The stated purpose in publishing these cases and responses is to aid practicing evaluators in maintaining high ethical standards. As the original introduction to the column states:Every evaluator should exercise constant vigilance to assure that every act performed as an evaluator represents exemplary ethical behavior. Yet, in the practice of evaluation, that ideal is often challenged by a variety of political, personal, and financial factors that could-if allowed-compromise that ideal and undermine the high ethical standards that must be maintained if evaluation is to serve well its purpose(s) in society. (Morris, 1998a, p. 71)