Kindergarten children were tested on Kershner's spatial model, two WISC performance tests, and two Piagetian tasks. Results validated Kershner's work but not his claims that his test measures conservation or dimensional concepts. (ST)

Reported is a study which measured conservation of length among kindergarten and first-grade subjects using several verbal and nonverbal procedures. The results indicated that conservation of length is not a simple unitary concept, but has empirical gradations. (Author/CT)

Analysis of task-related errors of 160 first graders tested for their ability to conserve multiple space relations supported Piaget's notion of representational space and the importance of particular field configurations. A figure's relative position was highly important to successful performance, whereas absolute orientation was a secondary…

The processes by which children construct images of anticipated end states of a transposition movement were examined on two tasks. Results support Piaget's (1977) hypothesis that reasoning on the basis of state correspondence defines a developmental level which precedes the development of transformational thought. (Author/MP)

This study is a partial replication and extension of research reported by Golomb and Cornelius in 1977. Training in the present study was significantly less effective than in the earlier research. Findings suggest experimenter and testing effects on performance. (RH)

Tests Piaget's assertion that the anticipation of conservation among otherwise nonconserving children is a pseudoconservation since it is limited to those lacking knowledge of covariation. Number, area, and length conservation tasks and a covariation task were given to 96 children from kindergarten through the fifth grade. (Author/SS)

For 89 White children 6 to 11 years old and of upper middle class, scores on Piagetian tasks of conservation of length and volume were related to age but field independence was correlated significantly to these scores. (Author)

The developmental relations between anticipatory imagery, conservation of length, and operational structures were investigated in 80 kindergarten and third-grade children by means of imagery tasks combined with a length conservation task. (MS)

Eight quantitative comparison tasks were administered to four- to seven-year-olds. Findings indicated that performance on comparison tasks was related to performance on a number conservation test and to age. Factor analysis yielded a unitary factor. (RH)

Children with mild learning difficulties (MLD) who had not developed conservation of number, length, weight, and volume worked on conservation problems. MLD children who worked on the problems with another child who challenged their nonconserving responses made more progress on the problems than did MLD children who worked on the problems in…