Guided self-determination (GSD) is an educational method developed to promote patient autonomy, participation, skills building and intrinsic motivation. In this evidence-based group-intervention the main objective is to implement and evaluate GSD through a randomised controlled trial among persons with Type 1 diabetes (18-55 years) and elevated HbA1c-levels for a prolonged period. Participants allocated for intervention met for seven group sessions supervised by trained nurses within the counselling method. The control group received traditional out-patient consultations - ‘care as usual’. Data collection was performed at baseline and after 9 and 18 months. An alliance is established between Haukeland University Hospital, Norway and Steno Diabetes centre, Copenhagen, Denmark, Centre of Evidence-Based Practice, Bergen University College, and Bergen University to conduct this intervention and thus make the best possible use of interrelated knowledge within the issue.