Erikson's theory proposes that personality develops through 8 stages of psychosocial development from infancy to late adulthood. At each stage, individuals face a psychosocial crisis that helps develop virtues. The stages include trust vs mistrust in infancy, autonomy vs shame and doubt in early childhood, initiative vs guilt in preschool years, industry vs inferiority in school age, identity vs confusion in adolescence, intimacy vs isolation in early adulthood, generativity vs stagnation in adulthood, and integrity vs despair in late adulthood. Successful completion of each stage leads to a healthy personality and the ability to develop strong relationships.