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ABSTRACT: Adult development is becoming an important field of study for psychology and other disciplines. Little has been done, however, to conceptualize the nature of adult development and to define the major issues in this field. The author summarizes his own formulations of life course, life cycle, life structure, and the adult development of the life structure in early and middle adulthood. He then discusses ix major issues that must be dealt with by every structural approach to adult development: What are the alternative ways of defining a structural stage or period? What relative emphasis i given to the structures as compared to the transitional periods? How can we make best use of the distinction between hierarchical levels and seasons of development? Are there age-linked evelop-mental periods in adulthood? What are the relative merits
Daniel J. Levinson (Wed,) studied this question.
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