All health care systems are facing increasing demands within limited resources. Most countries are introducing systems to assess “value for money” that offer approaches to prioritising health services that seek to gain legitimacy with those on whose behalf they function. These emerging processes face legal, political, methodological, philosophical and ethical challenges. Most approaches consider patient and public involvement as central to acceptability and legitimacy but struggle to gain meaningful interaction. This workshop will bring together global representatives of all the relevant disciplines to refine an emerging social values decision support tool that addresses content and processes values involved in prioritisation decisions and to plan its further testing with patients and the public in a range of countries. To set the context for this work an analysis of the relationship between the “right to health” and prioritisation approaches to health care commissioning will be presented with a view to developing a consensus to inform international and national policy