A research group was conducted during an intensive one-week workshop in Mexico with the aim being to test the effects of transactional analysis psychotherapy on participants’ self-esteem and quality of life. This article describes the workshop and two transactional analysis instruments that were especially designed and standardized for this study. These instruments—the Diagnosis Inventory of Ego State Boundary Problems and the Quality of Life Inventory—can be used as diagnostic tools in psychotherapy or further research.