 Methods: In a cluster-randomised trial in 40 primary care practices that participated until 2009 in the ADDITION Study, 150 T2DM patients 60 - 80 years, known with T2DM for 8-15 years, will be included. Practices are randomised a second time, i.e. intervention practices in the ADDITION study could be control practices in the current study and vice versa. For the GPs from the intervention group a 2-hour training in shared decision making SDM was developed as well as a decision support tool to use during the consultation. These GPs plan the first visit with the patients to decide on the intensity of the treatment, personalised targets and the priorities of treatment. The control group will continue with the treatment they were allocated to in the ADDITION study treatment-as-before. Follow-up: 24 months. The primary outcome is the proportion of patients who achieve all three treatment goals HbA1c, blood pressure, total cholesterol at 24 months. Secondary outcomes are the proportion of patients who achieve five treatment goals HbA1c, blood pressure, total cholesterol , body weight, not smoking, evaluation of the SDM process SDM-Q9, satisfaction with the treatment DTSQ, wellbeing and quality of life W-BQ12, ADD QoL-19, health status SF-36, EQ-5D and coping DCMQ. The proportions of achieved treatment goals will be compared between groups by estimating the relative risk of meeting the treatment targets. For the secondary outcomes mixed models will be used. 