Dyadic developmental psychotherapy (DDP) is an attachment-focused therapy developed by Drs. Daniel Hughes and Arthur Becker-Weidman. It is an evidence-based treatment for complex trauma, reactive attachment issues (RAD), and other issues with attachment. It is often used to treat children in foster care and adoptive families, especially those who have experienced trauma, abuse, or neglect. DDP is a family-focused approach to therapy that incorporates well-researched principles such as a focus on relationships, attunement, intersubjectivity, and sensitive responsiveness.