Background: Recent advances in the field of congenital heart disease (CHD) led to an improved prognosis of the patients and in consequence the growth of a new population: the grown up with congenital heart disease. Until recently, more than 50% of these patients were lost to follow up because of the lack of specialized structures. The critical moment is the transition between paediatric and adult unit. Therapeutic education is crucial to solve this issue by helping patient to become independent and responsible. The TRANSITION randomized trial aims to assess the impact of a transition education program on the quality of life (QoL) of adolescents and young adults with CHD. Methods: multicentre, randomised, controlled, parallel arm study in CHD patients aged from 13 to 25 years old. Patients will be randomised into 2 groups (Education program vs. no intervention). The primary outcome is the change in self-reported QoL between baseline and 12-month follow-up. A total of 100 patients in each group is required to observe a significant increase of the overall QoL score of 7±13.5 points (on 100) with a power of 80% and an alpha risk of 5%. The secondary outcomes are: clinical outcomes, cardiopulmonary exercise test parameters (VO2max,VE/VCO2 slope), level of knowledge, physical and psychological status.Discussion: As the current research is opening on patient related outcomes, and as the level of proof in therapeutic education still low, we sought to assess the efficacy of a therapeutic education program on the QoL of CHD patients with a randomized trial.Trial registration: This study was approved by the National Ethics Committee (South-Mediterranean IV 2016-A01681-50) and was registered on Clinicaltrials.gov (NCT03005626) on 29th December 2016