This document summarizes Erik Erikson's stages of psychosocial development theory, which has eight distinct stages from infancy to late adulthood. At each stage, the theory proposes that individuals face a psychosocial crisis between two opposing outcomes. Successful completion of each stage results in gaining a virtue that contributes to healthy development. The document lists each stage, corresponding virtue, psychosocial crisis, and significant relationships involved in navigating the crisis. It then provides two paragraphs discussing how the theory explains changes in relationships and goals over one's lifespan, and how understanding this theory can help nurses tailor care to patients' developmental experiences.