The survey asked respondents about cases of patients who request that treatment be withheld or withdrawn. Thirty-two case scenarios were included, which varied according to the type of treatment to be withdrawn or withheld, the capacity of the patient to make decisions, the medical condition of the patient (terminally ill or quadriplegic), and the type of treatment in question. (Examples of the scenarios are available from the authors.) Respondents were instructed to assume that the treatments were necessary to sustain the patients' lives, that the patients (or, in the case of a patient with dementia, the family who decided via substituted judgment) were not depressed, that no acute, reversible problem existed, and that the decisions were clearly expressed. For patients with dementia, no mention was made of an advance directive. Respondents were asked to indicate how likely they would be to withhold or withdraw treatment in each scenario, based on a 4-point Likert-type scale (4, very likely; 3, likely; 2, unlikely; and 1, very unlikely). Respondents were also asked whether they had training of any type (self-defined) in end-of-life care. Demographic questions about the respondents also were included.