English: Is research training of students the key responsibility of postgraduate supervisors? While many academics would agree, supervisory roles might involve more than training postgraduate students. This article argues for the importance of research training as well as development interventions for supervisors. Drawing on relevant conceptions and a proposed supervisor development scheme, twenty-one supervisors reported how their supervisory roles have changed after interventions in five developmental areas. Similarly, supervisors who participated in a four-day supervision conference reported important developmental gains. The article proposes that supervisors seem to assess their supervisory roles and responsibilities more holistically and critically after and as a result of development interventions.