Organisational level
Quantitative indicators of implementation success were derived from assessing outcomes against targets identified in the implementation plan. We planned to gather qualitative data about the implementation process, focusing in particular on leadership, organisational barriers and facilitators, and potential for sustainability, through interviews at the end of the 12-month implementation phase with a purposively-sampled set of up to 24 local steering group members representing organisations with good and poor implementation outcomes; for the topic guide, see Additional Text 3. We planned to re-interview up to eight Wave 1 interviewees after 12 months to explore the extent to which progress was sustained.