Supervisor induction and continued professional development programmes constitute good practice and are enshrined in institutional policies and national codes of practice. However, there is little evidence about whether they have an impact on either supervisors' learning or day-to-day practice. Set in a discussion of previous literature, this article unpacks the concepts "impact" and "evaluation" and assesses the medium- and longer term impact of the University of South Australia's doctoral supervisor induction programme, "Supervising@UniSA." It suggests that the workshop leads to the acquisition of understanding and knowledge and, for the majority of attendees, also has an impact on supervisory practice.