Current problems with the decision-making process for bioethical dilemmas are described, with emphasis on the social roles taken in this process by medical experts and laypersons. An approach is presented to improve bioethical decision making. Two consecutive steps are required. First, branching logic is used to separate the bioethical dilemmas into a series of independent, sequential decision points along a decision-making tree. This allows complex dilemmas to be dealt with more easily by resolving the individual component issues in a logical, stepwise fashion. Secondly, explicit criteria are used to decide whether each individual component is ethical or technical in nature. Using these two steps increases the likelihood that the professional and the layperson will assume their appropriate social roles and improve the overall decision-making process. How this approach can be applied to policy-making decisions, in addition to case-by-case deciding, is discussed, as are some of the settings in which the approach might be particularly helpful.