Erikson's Psychosocial Theory of Development: Young Adults The young adult has numerous stresses placed upon them through the route of development. Erikson has theorised developmental stages of growth into tasks. Of Eriksons' theoretical tasks, one task describes the theory of intimacy versus isolation. This task theory can be examined using the normative crisis model. The knowledge of developmental tasks of the young adult can be beneficial to the nurse especially associated with their ability to relate to the young adult. One of the stages in life is the young adult,