Although there is some evidence to support the value of medical school accreditation, the direct impact of this quality assurance initiative on patient care is not yet known. For both licensure and revalidation, some investigations have linked specific processes to quality indicators; however, additional evaluations should be conducted across the medical education and practice continuum to better elucidate the relationships among regulatory activities and patient outcomes. More importantly, the value of accreditation, licensure and revalidation programmes around the world, including the effectiveness of specific protocols employed in these diverse systems, needs to be better quantified and disseminated.