Abstract
Furthering the cause of consilience in the social sciences a model is proposed in which Eriksonian life span theory and life history theory are integrated. The model explains individual differences in the Eriksonian developmental stages as a function of the individual differences in developmental trajectories of life history theory as conceptualized by Belsky, Steinberg, and Draper (1991) . Erikson's fifth stage of identity formation is used to examine the model, with the results of three studies presented to illustrate the viability of the model. Future research should examine other aspects of the model and the relationship between the developmental trajectories in life history theory and the Eriksonian stages in greater detail.
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