--- - |2+ Abstract Objective To construct a model of shared decision making (SDM) about cancer treatment by conducting an extensive consultation of stakeholders, informed by the literature. Methods We interviewed 76 stakeholders: cancer patients, potential future patients, oncologists, nurses, and SDM‐researchers. We asked: “If I say ‘Doctors and patients making decisions together about cancer treatment’, what does this make you think about?”. Ideas were further solicited by presenting 19 cards each describing a possible SDM‐element. Interviews were inductively coded and analysed, and the emerging themes were integrated into a model. Results The model that was based on participants’ views, assigns specific roles in SDM to both oncologists and patients. Oncologists determine possible treatments; emphasise the importance of patients’ opinion; explain treatment options; get to know patients; guide patients; and provide treatment recommendations. Patients ask questions; express thoughts and feelings; consider options; offer opinions; and decide or delegate decisions to oncologists. Outside consultations patients search for information, prepare questions, and consider options. Conclusions Next to oncologists’ role, cancer patients also have a clear role in SDM about cancer treatment, during and outside consultations. Patients should receive the support they need to fulfil this requirement. - Psycho-Oncology, Volume 0, Issue ja, -Not available-.