This dissertation focused on the added value of personalized gamification as a factor to enhance implementation potential of eHealth interventions in youth mental healthcare. Mental health disorders are the leading cause of disability in adolescents. It is important for these adolescents to go into therapy, as adolescence is a period in live in which essential developments occur on which mental health disorders have a negative impact. Although psychosocial therapies are effective in reducing psychiatric symptoms in adolescents with mental disorders, there is still room for improvement. For example, because of premature termination of treatment, poor attendance of treatment‐sessions and a low or non‐adherence to homework assignments...@en