Developmental stages – why didn’t I know this?

Eric Erikson was a developmental theorist who studied his patients across various stages of development. His theory of psychosocial development is helpful to consider that all humans go through change as they grow and that conflict or crisis is often a necessary part of the transition from one stage to the next. In short Erikson believed that movement through eight stages was necessary to achieve satisfaction and contentment in life. The Eight Stages of Psychosocial Development are mapped out below.

Stage	Approximate Age	Psychosocial Crisis	Key Virtue	Primary Goal/Task
1. Infancy	Birth – 18 months	Trust vs. Mistrust	Hope	Establishing a sense of security and trust in caregivers.
2. Toddlerhood	18 months – 3 years	Autonomy vs. Shame & Doubt	Will	Developing a sense of personal control and independence.
3. Preschool	3 – 5 years	Initiative vs. Guilt	Purpose	Learning to assert power and control through play and social interaction.
4. School Age	6 – 12 years	Industry vs. Inferiority	Competence	Developing a sense of pride in accomplishments and abilities.
5. Adolescence	12 – 18 years	Identity vs. Role Confusion	Fidelity	Exploring personal values and beliefs to form a stable self-identity.
6. Young Adult	19 – 40 years	Intimacy vs. Isolation	Love	Forming intimate, committed relationships with others.
7. Middle Age	40 – 65 years	Generativity vs. Stagnation	Care	Contributing to society and guiding the next generation.
8. Late Adulthood	65+ years	Integrity vs. Despair	Wisdom	Reflecting on life to achieve a sense of fulfillment and acceptance.

Core Concepts

Ninth Stage: Later in life, Erikson’s wife, Joan Erikson, added a ninth stage for very old age (80s-90s) to address the unique physical and psychological challenges of extreme longevity.

Lifespan Perspective: Unlike many other theories, Erikson believed development continues throughout the entire lifespan rather than ending in childhood.

The Epigenetic Principle: This suggests that stages follow a natural, predetermined order, and successful mastery of one stage helps prepare for the next.

Resolution is Not Final: Individuals can revisit or struggle with unresolved issues from previous stages at any time.