Interpersonal effectiveness in therapy depends as much on the relationship between therapist and patient as on technique itself. In this lecture, Anton Hafkenscheid examines interpersonal reflective practice, with a focus on the mutual influence between therapist and patient and the way both content and relationship are at play in every clinical interaction. Using the interpersonal circle framework, he shows how communication patterns can be analyzed to better understand therapeutic effectiveness. The lecture explores how therapists can adapt their own communication style to strengthen the relationship and resolve conflict, with practical tools such as the Impact Message Inventory Circumplex to support and enhance the therapeutic alliance.