From The Atlantic: Using data and analytics to measure the effectiveness of psychotherapy for individual clients can engender openness in the therapist-client relationship and improve mental health outcomes.
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Were you the sort who uses nutrient therapy along with psychotherapy, I’d suggest you use the Hoffer-Osmond Diagnostic or the Experiential World Inventory tests to monitor your progress. You’d also find out something about your clients’ inner worlds, helping you understand what perceptual experiences are influencing their behavior.