Assessed the relative difficulty in the utilization of oddity and matching response strategies in 144 children, ages 5-13 years. A model of matching and oddity problem-solving is presented based on the data collected. (Author/ED)

The use of rules on nonverbal balance scale problems was studied among 5- to 19-year-olds. Latent class analyses indicated that children used rules, that different rules were used by children of different ages, and that both consistent and inconsistent rule use occurred. A model for the development of reasoning about the balance scale task was…

Three samples of 8- to 16-year olds were assessed three times at yearly intervals on eight water-level items. Within-child change over age was viewed as stochastic process of the child changing or remaining in one of three latent strategy states. Although there was improvement in task performance over age, the general finding was that strategy…

In this part of the Kansas City Study of Adult Life, educational implications of adult activities and goals were explored, with emphasis on effective living in middle life. Performance of adult developmental tasks and motivation toward effort in these areas were investigated. Criteria were offered for assessing high, medium, and low performance in…

The Conceptual Learning and Development (CLD) Model specifies four levels of concept attainment (concrete, identity, classificatory, and formal) and three uses of concepts (problem solving, subordinate-supraordinate, and principles). Longitudinal and cross-sectional studies of concept attainment may be conducted. The results of this study of 300…

Guided by a conceptual model linking discrepancies between parent and adolescent developmental expectations and adolescent adjustment and the quality of the parent-adolescent relationship, this study examined adolescent and parent beliefs about the age at which specific competencies should appear. Developmental timetables were grouped into…