Background: LaVigna, Christian, and Willis (2005) reported on a project where Institute for Applied Behaviour Analysis (IABA) staff trained a professional team in New Zealand (NZ) to provide behavioural services that met defined criteria. The NZ team was then trained to train other practitioners to meet the same professional standards. However, no client outcomes were reported in that study. Method: This study replicates the NZ study within disability services in Tasmania, Australia. Further, this study examined the associated client outcomes and the impact of the training on severity ratings of subsequent referrals. Results: Tasmanian trainers trained participants to provide behavioural services that met the same professional standards. Client behavioural outcome data showed significant improvement. Referral data showed decreases in severity ratings. Conclusions: The trainer of trainers process is effective in training staff to meet defined professional standards, including desired client outcomes, and to effectively make positive behaviour support accessible to a large number of people. (Contains 4 figures and 5 tables.)