Erikson was a Neo-Freudian. He has been described as an "ego psychologist" studying the stages of development, spanning the entire lifespan. Each of Erikson's stages of psychosocial development are marked by a conflict, for which successful resolution will result in a favourable outcome, for example, trust vs. mistrust, and by an important event that this conflict resolves itself around, for example, meaning of one's life.

Favourable outcomes of each stage are sometimes known as "virtues", a term used, in the context of Eriksonian work, as it is applied to medicines, meaning "potencies." For example, the virtue that would emerge from successful resolution. Oddly, and certainly counter-intuitively, Erikson's research suggests that each individual must learn how to hold both extremes of each specific life-stage challenge in tension with one another, not rejecting one end of the tension or the other. Only when both extremes in a life-stage challenge are understood and accepted as both required and useful, can the optimal virtue for that stage surface. Thus, 'trust' and 'mis-trust' must both be understood and accepted, in order for realistic 'hope' to emerge as a viable solution at the first stage. Similarly, 'integrity' and 'despair' must both be understood and embraced, in order for actionable 'wisdom' to emerge as a viable solution at the last stage.

The Erikson life-stage virtues, in the order of the stages in which they may be acquired, are:

1. hope - Basic Trust vs. Mistrust - Infant stage. Does the child believe its caregivers to be reliable?
2. will - Autonomy vs. Shame and Doubt - Toddler stage. Child needs to learn to explore the world. Bad if the parent is too smothering or completely neglectful.
3. purpose - Initiative vs. Guilt - Kindergarten - Can the child plan or do things on his own, such as dress him or herself. If "guilty" about making his or her own choices, the child will not function well. Erikson has a positive outlook on this stage, saying that most guilt is quickly compensated by a sense of accomplishment.
4. competence - Industry vs. Inferiority - Around age 6 to puberty. Child comparing self worth to others (such as in a classroom environment). Child can recognize major disparities in personal abilities relative to other children. Erikson places some emphasis on the teacher, who should ensure that children do not feel inferior.
5. fidelity - Identity vs. Role Confusion - Teenager. Questioning of self. Who am I, how do I fit in? Where am I going in life? Erikson believes that if the parents allow the child to explore, they will conclude their own identity. However, if the parents continually push him/her to conform to their views, the teen will face identity confusion.
6. love (in intimate relationships, work and family) - Intimacy vs. Isolation - Young adult. Who do I want to be with or date, what am I going to do with my life? Will I settle down? This stage has begun to last longer as young adults choose to stay in school and not settle.
7. caring - Generativity vs. Stagnation - the Mid-life crisis. Measure accomplishments/failures. Am I satisfied or not? The need to assist the younger generation. Stagnation is the feeling of not having done anything to help the next generation.
8. wisdom - Ego Integrity vs. Despair - old age. Some handle death well. Some can be bitter, unhappy, and/or dissatisfied with what they have accomplished or failed to accomplish within their life time. They reflect on the past, and either conclude at satisfaction or despair.

On ego identity versus Role Confusion, ego identity enables each person to have a sense of individuality, or as Erikson would say, "Ego identity, then, in its subjective aspect, is the awareness of the fact that there is a self-sameness and continuity to the ego's synthesizing methods and a continuity of one's meaning for others" (1963). Role Confusion, however, is, according to Barbara Engler in her book Personality Theories (2006), "The inability to conceive of oneself as a productive member of one's own society" (158). This inability to conceive of oneself as a productive member is a great danger; it can occur during adolescence when looking for an occupation.
[edit] Scientific support

Most empirical research into Erikson's theories has focused on his views regarding the attempt to establish identity during adolescence. His theoretical approach has been studied and supported, particularly regarding adolescence, by James Marcia [11]. Marcia's work extended Erikson's by distinguishing different forms of identity, and there is some empirical evidence that those people who form the most coherent self-concept in adolescence are those who are most able to make intimate attachments in early adulthood. This supports Eriksonian theory, in that it suggests that those best equipped to resolve the crisis of early adulthood are those who have most successfully resolved the crisis of adolescence.
Erikson's write's "a sense of shame is part of the second stage of psychosocial development. In the first stage a child needs to establish a sense of basic trust. This basic trust must be greater than his sense of mistrust. We can understand healthy shame best by understanding this trust stage of psychosocial development...Once basic trust has been established, the child is in a position to develop shame. The shame may be healthy or toxic." Erikson said that between the ages of 15 months and three years, "the psychosocial task for this stage of development is to strike a balance between autonomy and shame and doubt."

* Childhood and Society (1950)
* Young Man Luther. A Study in Psychoanalysis and History (1958)
* Identity: Youth and Crisis (1968)
* Gandhi's Truth: On the Origin of Militant Nonviolence (1969)
* Adulthood (edited book, 1978)
* Vital Involvement in Old Age (with J.M. Erikson and H. Kivnick, 1986)
* The Life Cycle Completed (with J.M. Erikson, 1987)