A theory of cognitive development: The control and construction of hierarchies of skills

Skill theory provides tools for predicting developmental sequences and synchronies in any domain at any point in development by integrating behavioral and cognitive-developmental concepts. Cognitive development is explained by skill structures called "levels," together with transformation rules relating these levels to each other. The transformation rules specify the developmental steps by which a skill moves gradually from one level of complexity to the next. At every step in these developmental sequences, the individual controls a particular skill. Skills are gradually transformed from sensory-motor actions to representations and then to abstractions. The transformations produce continuous behavioral changes; but across the entire profile of a person's skills and within highly practiced task domains, a stagelike shift in skills occurs as the person develops to an optimal level. The theory suggests a common framework for integrating developmental analyses of cognitive, social, language, and perceptual-motor skills and certain behavioral changes in learning and problem solving. (6 p ref)