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Specifications are offered for a stage theory of adult cognitive development. It is argued that cognitive processes are differentially organized and expressed during periods labeled as acquisitive, achieving, responsible, executive and reintegrative. Current psychometric technologies may suffice for the description of cognitive behavior during the acquisitive and achieving periods. Such techniques are inadequate, however, to describe and understand cognitive function beyond young adulthood, and the development of novel technologies is suggested for the study of cognitive development in mid-life and old age.
K. Warner Schaie (Wed,) studied this question.