Erik Erikson proposed 8 stages of psychosocial development across the lifespan. Each stage presents a psychosocial crisis between opposing tendencies that must be resolved. Trust vs mistrust in infancy; autonomy vs doubt in early childhood; initiative vs guilt in preschool years; industry vs inferiority in school age; identity vs role confusion in adolescence; intimacy vs isolation in young adulthood; generativity vs stagnation in middle adulthood; and integrity vs despair in late adulthood. Successful completion of each stage results in a basic strength that contributes to healthy development.