Published online by Cambridge University Press: 22 September 2009
Human ontogeny is characterized by a great openness and plasticity: intentionality, choice, and self-cultivation in personal development are made possible, but at the same time are also necessitated, by the modifiability of developmental trajectories across the life-span. We select and construe our developmental paths according to our self-definitions and identity projects, which are themselves developmental outcomes; as soon as we have formed representations of our self and personal development, these representations in turn guide the actions and decisions through which we shape our development and aging (Brandtstädter, 1998; Pulkkinen and Rönkä, 1994).
We begin our life with an infinity of possible developmental paths; at the end, however, we have realized only one. The one path that eventually constitutes our life history is to a large extent the result of our intentional actions and choices, but it also reflects constraints and contingencies that we have not intentionally chosen. The norms, institutions, and knowledge systems that prevail within a given cultural and historical context constrain our action spaces; historical change and cultural evolution continously create and destroy developmental options. The existential fact of a limited life-time already constrains intentional choice, as well as possibilities of undoing the unintended results of intentional choices. These latter restrictions become particularly salient in later life; with advancing age, we may come to realize that some of our goals may remain forever unachieved.
Humans select and shape their developmental paths under conditions of “bounded rationality” (Simon, 1983).
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