Background: Proven training of health professionals’ in shared decision making (SDM) competencies are rare. Sound evaluation requires consideration of such measures’ complex character. Objectives: We aim to structure our reporting on a series of studies to develop short in situ training for clinicians according to the complex interventions framework. Methods: We started with a comprehensive literature search. Moreover, theory and conceptual knowledge were worked up with regard to didactic requirements. Core components such as measurement-based video feedback or a video tutorial were piloted in scientific workshops. A pretest with 10 clinicians assessed patient involvement with the MAPPIN’SDM before and after the so called doktormitSDM training. Then, in a multicenter RCT (N=40), SDMmass was used as primary endpoint, a compound measure for patient involvement. To allow for broad scale implementation, doktormitSDM didactic and contents were translated into an online format. The tutorial addresses a population of 12,000 practitioners counselling colon cancer screening decisions. We piloted the new format and newly developed components as an interactive video learning parkour. Results: The training has been shown to respond to a lack of research and meets specific needs by applying criteria of SDM and EBPI in a theory-based didactic concept. Components and entire version are proven feasible, time economic and motivating for clinicians. Promising results of the pre/post study informed the training’s revision and the RCT design. DoktormitSDM turned out efficient in changing communication quality of clinician-patient decision-making dyads. The RCT, however, still revealed practical difficulties in delivery to trainees. Physicians completing the online tutorial and passing a test at the training platform Curacampus, receive a SDM certificate and credits. Certified doctors are now authorized to invoice for higher counselling rates.Conclusions: A promising and malleable approach to improving SDM in medical consultations has been developed and studied successfully. Whether doktormitSDM can change daily practice is a matter currently undergoing further investigations.