 According to O'Connor and Nilsen, although other aspects of treatment are applied, the holding component has attracted most attention because proponents believe it is an essential ingredient.They also considered the lack of available and suitable interventions from mainstream professionals as essential to the popularization of holding therapy as an attachment therapy.In 2003, an issue of "Attachment & Human Development" was devoted to the subject of attachment therapy with articles by well-known experts in the field of attachment.