This article examines the legal doctrine and ethical norm of informed consent and its deficiencies, particularly its concentration on physician disclosure of information rather than on patient understanding, which led to the development of shared decision making as a way to enhance informed consent.As a vague and imprecise rubric, shared decision making encompasses several different approaches.Narrower approaches presuppose an individualistic account of autonomy, while broader approaches view autonomy as relational and hold that clinicianpatient relationships grounded in good communication can assist decision making and foster autonomous choices.Shared decision making faces conceptual, normative, and practical challenges, but, with its goal of respecting, protecting, and promoting patients' autonomous choices, it represents an important cultural change in medicine.