All evaluators face the challenge of striving to adhere to the highest possible standards of ethical conduct. Translating the AEA's Guiding Principles and the Joint Committee's Program Evaluation Standards into everyday practice, however, can be a complex, uncertain, and frustrating endeavor. Moreover, acting in an ethical fashion can require considerable risk-taking on the evaluator's part. In the Ethical Challenges column, commentators share their views of how evaluators might respond to specific problematic situations, linking their analyses to the principles and standards they believe are most relevant to the case. Not surprisingly, the perspectives that commentators offer are not always in agreement. When this occurs, reflection on the nature and sources of these differences of opinion can enhance our sensitivity to the ethical dimensions of our evaluation work, and our awareness of the options available for addressing them. This brief article presents the "Ethical Challenge" for this issue of "American Journal of Evaluation." [See also EJ689216: "Ethical Challenges"]