 Prior and Glaser state that although the Myeroff study claims it is based on attachment theory, the theoretical basis for the treatment is in fact Zaslow.Dyadic developmental psychotherapy was developed by psychologist Daniel Hughes, described by the Task Force as a "leading attachment therapist".Hughes' website gave a list of attachment therapy techniques, repeated by the APSAC Task Force from an earlier website, which he stated do not or should not form part of dyadic developmental psychotherapy, which the Task Force took as a description of attachment therapy techniques.