Preservice teachers administered Piagetian tasks to elementary students. On the whole data collected compared favorably with the findings of Renner (EJ 044 727) in showing that students achieved conservation of substance (liquids and solids), length, area, and weight at later ages than stated by Piaget. No significant sex differences were found.…

Describes a study, involving 120 first grade children, which supports the hypothesis that the rate of attainment of conservation skills is significantly enhanced by experiences made possible by the first grade program of SCIS. Describes the six conservation tasks used for pre-tests and post-tests: number, liquid amount, solid amount, length,…

This article reports a study conducted with fourteen learning-disabled elementary students to determine the growth of achievement and conservation abilities after using the "Sink or Float" unit of the Elementary Science Study. (MK)

Reports the results of a study in which children below the age of eleven were tested on their ability to perform several tasks of class inclusion and a task relating to the conservation of weight. (JR)