Hans Lieb addresses the arguments for and against disorder-oriented approaches and demonstrates that as a therapist, one can maintain their systemic identity while also thinking and acting in a disorder-specific manner. He connects theoretical explanations of system theory and system therapy with practical examples. The history of psychotherapy and its approach to diagnoses is examined, as well as the healthcare system with its professions and roles. The author particularly aims to define the role of disorder-specific system therapy as a professional member within the healthcare system. A charter for disorder-specific system therapy provides a guiding framework for his discussions and invites further dialogue.