Reports the results of testing 143 college freshmen on the meaning of density. Relates reasons for student inability to conceptualize density to the hierarchy of experiences which leads to the understanding of the density concept. (PR)

Speed and acceleration tasks were administered to children in grades three through six. Piaget's results were replicated. Suggestions concerning the appropriate grade level to introduce different types of motion tasks are made. (AL)

The construct of conservation, as presently studied in dichotomous form (i.e., Conservers vs. Nonconservers), may be a convenient fiction, but that is all it is. There seems to be great need to treat this dimension as the continuous variable it really is. (Authors)

The primary purpose of this study was to investigate conservation acquisition across subcultural groups. (Author)

A combination of readiness and body-part training was the most effective in producing number conservation with external objects. (Authors)

Evaluated the possibility that three-year-olds solve small-number conservation problems by an empirical procedure whereby the sets are quantified each time presented. Children chose the more numerous of two arrays, one containing two elements and the other three elements. Results disconfirmed claims that three-year-olds can conserve small numbers.…

Examines the imaging processes that children at different operatory levels use on a spatial rotation task. Subjects were 80 elementary school girls ranged in age from 5 to 10.2 years. (MP)

Five-year-olds were found to give more conserving responses to small number versions than to a large number version of a test of identity conservation. Superiority of performance with small number versions was reduced but not eliminated when the opportunity to requantify was removed. (Author/SJL)

Preschool children were trained to acquire transitivity, conservation, and class inclusion of length via feedback to their judgments. Feedback was found to facilitate the learning of all three concepts. (ST)

Research supported by the U.S. Office of Economic Opportunity grant 1492.

A total of 100 second graders were pretested for conservation of length and weight. Fifty pairs were then formed, each pair consisting of one conserver and one nonconserver. During the second session, the children attempted to resolve their opposed answers on the conservation tasks and on two control questions as well. On both length and weight,…

A group of 161 kindergarten and first grade children were instructed in mathematics using exercises in linear measurement to increase understanding of unit-quantity relations. A comparison group made up from two adjacent and comparable middle-class schools was taught mathematics without intervention into the mathematics content. Treatment and…

Studied were 48 retarded children, 9- to 18-years-old, (mental age 4 to 8 years) to determine effects of task screening and objectivity of protocol scoring on achievement of the concept of conservation. Results indicated no significant differences in achievement of conservation as a function of either experimental variable. Also data indicated…

The value of verbal rules given to learners as an instructional aid in forming desired concepts was investigated in this study. Two programs dealing with the concept of conservation of energy in heat exchange between liquids were prepared in the form of self-instructional booklets. One presentation used a picture-rule or expository treatment, and…

A study was conducted to measure the degree to which groups of infants could generalize color across objects of different forms and sizes and generalize from across objects of different color and sizes and to see whether color or form would dominate in their generalizations. Ss were 8-13-month-old Caucasian infants. All tests had 16 Ss except the…