To implement shared decision-making, both physicians and patients should commit to it and engage in a mutual decision process. Most research, however, has addressed interventions that either focus on the doctors' side (e.g. "communication skills") or on informing patients about treatment options (e.g. "decision aids"). These approaches have been shown to be feasible in clinical practice but had no strong effects on treatment patterns or adherence, possibly because they were insufficient to motivate and enable patients to engage actively in decision-making. Moreover, these interventions still rely on the doctor's willingness to share decisions, which has been shown to vary considerably.