Pain & Policy Studies Group (PPSG) refers to a World Health Organization Collaborating Center at the University of Wisconsin Paul P. Carbone Cancer Center in Madison, Wisconson, USA. This group coordinates a program of international policy studies to identify and address barriers to opioid availability in national policy and national health care systems. PPSG provides technical assistance and monitors progress to improve the availability of opioid analgesics for pain management and palliative care.