Erik Erikson proposed eight stages of psychosocial development across the lifespan. Each stage presents a psychosocial crisis that must be navigated, with the outcome being a virtue that contributes to healthy development. The stages involve developing trust, autonomy, initiative, industry, identity, intimacy, generativity, and integrity. Erikson's theory views development as influenced by biological, psychological, and social/cultural factors interacting across one's whole life.