Abstract
This paper attempts to describe links between the transactional or dialectical and the mechanistic models of development and to provide a rationale for why both types are useful. Examples of data sets, deriving principally from the early experience literature, are provided which conform to both, and it is concluded that the applicability of the model for describing behavioral development is strongly influenced by where the individual stands on three empirical dimensions: (1) the relative power of the environments that the individual is exposed to; (2) the plasticity of the individual's behavior; and (3) the deviation of the individual from developmental norms. These factors crucially affect the degree of reciprocity found in organism-environment interactions, and the results suggest that differences between developmental models are reconcilable.
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