Why do we need another typology system, particularly one built on a system of 9 types? The hypothesis which seems to fit the two systems is that each system measures a different part of our mental apparatus which Jung calls the psyche. MBTI appears to be concerned with the conscious, cognitive part of the psyche, while the Enneagram is focused on unconscious, motivating forces in the depths of the psyche, perhaps associated with its archetypal structure. The two systems come at the psyche in two contrasting ways.
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