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Stone, C. Addison; Forman, Ellice A. – Journal of Special Education, 1988
Learning-disabled ninth-graders (n=58) completed a modified Piagetian isolation-of-variables task, and were compared to normally achieving ninth-graders and fourth-graders. Through cluster analysis, four different patterns of task approach were identified, representing normal performance, general conceptual disorder, specific developmental delay,…
Descriptors: Age Differences, Cluster Analysis, Cognitive Processes, Comparative Analysis