On November 13, 2024, Peter Schwartz, MD, PhD presented "Evaluating Patient Decisions: Why, When, and How" as part of our Bioethics Grand Rounds Series. Decision science’s studies of ways to improve “decision quality” and “shared decision making” are clearly relevant to bioethics’ goal of advancing patient autonomy. Interpreting the scientific findings, though, and applying them to bioethics requires close examination and some skepticism regarding measures of decision quality and the meaning of this concept.