Classical directive hypnosis is the historical form of therapeutic hypnosis, using direct and authoritative suggestions to induce trance and modify behaviors. It relies on the subject's suggestibility.
Self-hypnosis is the autonomous practice of hypnosis, allowing self-induction of an altered state of consciousness. A powerful empowerment tool, it extends and reinforces the effects of hypnotherapy sessions.
Ericksonian hypnosis, developed by Milton H. Erickson, is a permissive and indirect approach to therapeutic hypnosis. It uses metaphors, indirect suggestions and the patient's unconscious resources to facilitate change.