The Dyadic Developmental Psychotherapy Institute (DDPI) and its overseeing body, the DDPI Board of Directors, were established in 2009. DDPI is a not-for-profit organisation and is based in the USA. DDPI aims to educate, facilitate, promote and advance Dyadic Developmental Psychotherapy and Dyadic Developmental Practice. The DDPI provides a robust certification of this internationally. DDPI provides a certification process for practitioners and therapists who are using the DDP model of intervention. Certified Practitioners in DDP have demonstrated their knowledge and competence in using the model’s core principles in their practice.