Objectives To assess the effectiveness of an integrated educational strategy to change clinician behaviour and reduce the number of hysteroscopies and/or dilatation and curettages for women 40 years or less with dysfunctional uterine bleeding (DUB). Design Randomised controlled trial with six-month followup. Setting Public teaching hospital gynaecology units with 12,000-13,000 relevant procedures per year. Participants Six public gynaecology units made up of 62 gynaecologists or trainees allocated at random to intervention group - three, or control group - 3. Intervention An educational strategy that included dissemination of evidence-based guidelines via a problembased interactive workshop facilitated by an opinion leader and a laminated algorithm and guidelines. Main outcome measures The number of hysteroscopies and/or dilatation and curettages performed for DUB on women 40 years or less, clinician behaviour change and perceived booking rates of the procedure. Results At six months, there was no significant effect on the number of hysteroscopies and/or dilatation and curettages performed but there was an increase in evidence-based behaviour.