Not enough research.
What is Psychosynthesis?
1. Wide variety of techniques and methods to be used within the psychosynthesis 
context. Dialogue, Gestalt techniques, dream work, guided imagery, affirmations, and meditation are all powerful tools for integration, but the attitude and presence of the guide are of far greater importance than the particular methods used.
2. Sand tray, art therapy, journaling, drama therapy, and body work; cognitive-behavioral techniques; object relations, self psychology, and family systems approaches, may all be used in different contexts, from individual and group psychotherapy, to meditation and self-help groups.
How To Therapy 