The id forms the instinctual, mostly psychophysiological basis of the whole structure. The ego, which is mostly based on the id, is the part that comes in contact with the external world. It is formed by the process of contact with and adaptation to the environment, mostly the parents. The superego is a structure that forms the apex of the psychic structure and includes the ideals of the personality and the principles of judgment. It is the seat of what is customarily called the conscience. It develops mainly by internalizing and identifying with the prohibitions, rules, values, and preferences of the parents and society at large. The sequence of development in the Diamond Approach follows the line of regression of this structure. The part last formed and organized, the superego, becomes the first part the individual deals with and understands. Then the ego becomes the focus, and finally the id itself with its instincts and drives.