Background: Positive behavioural support (PBS) has been identified as a means of improving the quality of life and support of people with an intellectual disability. This qualitative study explored the views of service providers about a regional PBS programme, that was underpinned by a workforce development approach. Method: Semi-structured interviews were conducted with senior staff (n = 42), from organizations which provided services to people with an intellectual disability, about their views about, and perceived impact of, the PBS programme, Data were analysed using thematic analysis. Results: Two themes were identified: "It's what PBS is about, isn't it?" emphasized the importance of the programme being systemic- and evidence-based; "Macro to micro" highlighted the different points in the systems of care at which the programme was seen to impact. Conclusions: We discuss the results in the context of the study limitations.