This chapter looks at how deliberative consensus is often used to making evidence-based recommendations to guide professional practice and public policy. When used for such purposes, deliberative consensus involves considerations additional to what the scientific evidence shows, in particular, value judgements about various courses of action. The evidence-based medicine movement is examined as an influential example of the use of deliberative consensus to guide medical practice. However, consensus processes have also been used to develop guidelines and position statements on practice and policy in other areas, with the work of the Intergovernmental Panel on Climate Change an important example.