According to Erik Erikson’s Psychosocial Development Theory, major conflict in infancy period is trust vs. mistrust. Major conflict in early childhood period is autonomy vs. shame and doubt. Major conflict in play age period is initative vs. guilt. Major conflict in shool age period is industry vs. inferiority. Major conflict in adolescence period is identity vs. role conflict. Major conflict in young adulthood period is intimacy vs. isolation. Major conflict in middle adulthood period is generativity vs. stagnation. Major conflict in old age period is ego integrity vs. despair.