Several tasks were developed to investigate adolescents' ability to see correlations in data and to test hypotheses. Emphasis was placed on methodology: do students clearly understand the problem and do the tasks tap the skills they claim to? The 20 ninth-grade and 20 eleventh-grade boys and 15 college freshmen were tested. Most students did…

A multifactor instrument, the Bentler Interview Developmental Scale (BIDS), was used to measure developmental changes in children from birth to age 7. The device consisted of 115 age related items to which the mother responded. Data was gathered through interviews of the mothers of sample children throughout the United States. Reliability of the…

This methodological investigation examines the accuracy of narrative-based scaled ratings covering several post high school years. Guided narratives by young adults described developmentally relevant behaviour and context for each month between ages 17 and the mid-20s. "Prospective" narratives covered shorter time periods in three interviews…

The relationship between performance on various Piagetian and reading achievement tasks as examined through 26 correlational studies is reviewed. The following areas of concern are addressed: (1) sample characteristics of the subjects; (2) classification of the Piagetian tasks into five categories of logical operations, spatial concepts, general…

Piaget's model of children's conceptual learning and development was compared with Klausmeier's Conceptual Learning and Development (CLD) model in a longitudinal study. The CLD model suggests four successive levels of concept learning: (1) concrete--recognizing an object which has been encountered previously; (2) identity--recognizing a known…