The Magna Carta presents Carl Jung's empirical discoveries of the different decision-making functions of consciousness. Jung's book on the psychological types is the first and only purely psychological work and theory ever developed on decision-making. Jung analyses and classifies the formation of the empirical material of individuals when actively engaged in decision-making and which is observable in their verbal and written self-representations. The Magna Carta presents Carl Jung's concepts in a narrative format in his own words, accessible to students, the educated layperson who wrestles with self-knowledge, and the specialist.