According to Sigmund Freud, psychodynamic model is the psychological force that represents a person's values and ideals. He believed that three central forces shape personality.
1. The id contains instinctual needs.
2. The ego employs reason.
3. The superego represents a person's values and ideals.
a chemical process in which substances act mutually on each other and are changed into different substances, or one substance changes into other substances.
