Examines the interplay between genes and environment and argues that the development of much individual variation can be explained in terms of relatively simple forms of underlying regulation. Looks at "sensitive periods," during which variation is produced by experience received at a particular age. Includes a discussion of the…

Attempts to describe links between transactional or dialectical and mechanistic models of development and provides a rationale for why both are useful. Examples of data sets deriving from early experiences are provided. Concludes that the applicability of the model for describing behavioral development is influenced by inter-/intra-individual…

Analyzes multiple components of planning, including problem representation, goal selection, a decision to plan, strategy choice, strategy execution, and monitoring. Analyzes three tasks typically used to study planning: the Tower of Hanoi; errand scheduling; and story comprehension. Argues that the components required to perform a planning task…