Most of the frameworks that have been constructed to mark off the changes in the cycle of adulthood are characterized by a particular focus such as developmental ages, the role of age and timing, or ego development. The theory of Erik Erikson, based upon his clinical observations, represents these crucial turning points in human development: ages 15-22, identity and role confusion; ages 18-28, intimacy versus isolation; ages 25-45, generativity versus stagnation; and ages 45 and over, ego integrity versus despair (maturity). Among the recent theorists with different developmental frameworks of adult life cycles, Gail Sheehy labels the periods of change as pulling up roots (18-22), the trying twenties, catch 30 (28-32), rooting (32-39), deadline decade (35-45), renewal or resignation (midforties). Sheehy and others who parallel her structure contend that each of these stages must be encountered sequentially. When various frameworks are overlapped, the following six stages are revealed: leaving the family (16-22), reaching out (23-28), questions, questions (29-34), midlife explosion (35-43), settling down (44-50), and the mellowing (50 plus). Consideration of the life cycle reveals general characteristics of adult life; points to the inevitability of change; discounts cultural, sex, social class, and historical differences; and facilitates coping in times of stress. (MAI)