The effect of a program to train clinicians to support patients making decisions about place of end-of-life care was evaluated. In all, 88 oncology and/or palliative care nursing and allied health providers from three Ontario health networks were randomly assigned to an education or control condition. Quality of decision support provided to standardized patients was measured before and after training, as were participants' perceptions about the acceptability of the training program and their intentions to engage in patient decision support. Compared to controls, intervention group members improved the quality of decision support provided and were more likely to address a wider range of decision-making needs. Intervention group members scored higher on a knowledge test of decision support than controls and rated the components as acceptable. Improvements in the quality of decision support can be made by providing training and practical tools such as a patient decision aid.