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Campbell, Susan B. – Developmental Psychology, 1973
These data support the notion that amount of maternal involvement in task solution is determined partly by task difficulty and the child's ability to complete the tasks presented. (Author)
Descriptors: Conceptual Tempo, Difficulty Level, Hyperactivity, Males
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MacKay, C. K.; And Others – Developmental Psychology, 1972
One finding is that the children in this study did not reach a level in the development of these concepts expected by Piaget of 9-year-olds. (Authors/CB)
Descriptors: Concept Formation, Conservation (Concept), Developmental Tasks, Difficulty Level
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Horowitz, Frances Degen; And Others – Developmental Psychology, 1972
Descriptors: Age Differences, Cross Sectional Studies, Data Analysis, Developmental Psychology