In this book, Erikson thinks that Freud’s 5-stage psychosexual development theory will not be enough, and adds 3 more stages to this stage and argues that, unlike Freud, development is lifelong. Every universe has an element of personality to be earned, and to those that need to be earned; He defined the features that should not be acquired as syntonic and the features that should not be acquired as dystonic. Contrary to impulses, he particularly emphasized social elements, and separated from Freud by saying that a personality trait that is not acquired in one period can also dig in other periods.