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This paper proposes a neo-Piagetian structural model of adult development. It is argued that propositional logic may fail as a device for regulating affect and action, and only prefigures rather than embodies mature structures of self-regulation. Three adult stages of logic are proposed: intrasystemic (formal realism), intersystemic (contextual relativism), and autonomy. These stages can serve as a broad organizational device for understanding a wide array of adult developmental phenomena, including cognitive, affective, ego, and interpersonal development.
Gisela Labouvie‐Vief (Wed,) studied this question.