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DDPI Worldwide’s Dyadic Developmental Psychotherapy added to California Evidence-Based Clearinghouse Program Registry

23 September 2026

Dyadic Developmental Psychotherapy (DDP), as created by Dan Hughes and certified by DDPI Worldwide, is now included in the California Evidence-Based Clearinghouse (CEBC) Program Registry in the US.

CEBC is a highly respected, state-run organisation that independently assesses evidence-based therapeutic practices for use with children and their families. Child welfare professionals, including academics, clinicians, social workers, and agencies (among many others), from across the US, consult the registry when considering using interventions.

The inclusion of DDP as “DDP-DDPI“, not only introduces the model to whole new groups of professionals and organisations, but it also affirms the use and therapeutic relevance of DDP with children impacted by early-childhood trauma. Government, academic and non-profits organisations, commissioners and individuals can have confidence that DDP is a valid and appropriate treatment with clear clinical pathways and practice standards.

Entry also formally recognises DDPI Worldwide as the official certifying and training body for DDP as created by Dan Hughes, reflecting our deep commitment to maintaining high standards, quality and fidelity to the model.

Dr. Vicky Sutton, Clinical Director, writes:

“We are delighted that Dyadic Developmental Psychotherapy has been added to the California Evidence-Based Clearinghouse Program Registry. This is a significant step in growing the DDP community in the United States and in making DDP more visible and accessible to professionals and organisations working with children and families impacted by developmental trauma. We hope this recognition will help strengthen relationships with a wide range of practitioners, agencies, researchers and commissioners who share DDPI Worldwide’s commitment to relational healing, embodied safety, and the core values at the heart of DDP”.

DDP-DDPI currently has an “NR” scientific rating as we wait for the results of The Relationships in Good Hand Trial (RIGHT). RIGHT is a three-phase feasibility trial being conducted in the UK and led by Professor Helen Minnis at Glasgow University, in partnership with the University of Oxford, the University of Nottingham, NHS Lanarkshire, and over 25 UK local authorities and foster and adoption agencies. It is being funded by the National Institute for Health Research (NIHR), part of the UK Government’s Department of Health and Social Care.

Going forward, we are excited to see the growth of DDP in the US, especially within organisations as they look to fund DDP programs and research, confident in the validity of our program and the growing the evidence base.


Liz Tower

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