Erik Erikson proposed an 8-stage theory of psychosocial development across the lifespan. Each stage is characterized by a developmental crisis between two opposing psychosocial attitudes. Successful completion of each stage results in a healthy personality and the acquisition of basic virtues. The stages include trust vs mistrust in infancy, autonomy vs shame and doubt in early childhood, initiative vs guilt in play age children, industry vs inferiority in school-aged children, identity vs role confusion in adolescence, intimacy vs isolation in young adults, generativity vs stagnation in adulthood, and ego integrity vs despair in late adulthood.