Data collection
Qualitative process evaluation data was collected systematically throughout the trial. The implementation program was sequentially introduced to the participating departments in a randomized order through three implementation intervals with a duration of six months each (cp. Fig. Qualitative process interviews with HCPs followed a semi-structured interview guide, which was not pilot tested. Interviews were conducted to assess HCPs’ views on SDM implementation in general and the six implementation strategies of the implementation program in particular. Participants were asked about 1) their knowledge of the trial, the implementation program and its six implementation strategies, 2) their access to knowledge and information about the trial and implementation program, 3) their experience when participating in SDM group training and individual coaching sessions, 4) their attitudes and beliefs about the implementation strategies including influencing factors on their implementation, and 5) additional feedback regarding the trial, implementation program, or SDM in general. Additionally, demographic data (i.e., age, profession, work experience) were assessed from all participants. The interview guide can be found in Additional File We additionally collected qualitative observational data through field notes during the preparation phase and all implementation intervals and measurement waves of the trial [Last, minutes of meetings with clinical cooperators and of SDM training sessions were included in the qualitative process evaluation. However, minutes did not exist for every meeting or training session due to limited personnel resources.