Discussed are the results of interviews with 63 Australian children (interviewed in English) and 62 Nigerian children (62 interviewed in English and 60 interviewed in Yoruba) to determine how they used number concepts in discussing five demonstrations manipulating physical matter. Differences between the two groups are considered. (RH)

Hypothesized that there would be no significant sex differences in the performance of conservation tasks on substance or volume, among 247 Ibo-speaking Nigerian children. Attributed confirmation of the hypothesis to social change and greater sexual equality in this developing society. (GC)

Investigates the effect of the Verbal Rule Instruction Technique in facilitating the acquisition of conservation concepts. Data were collected from 247 Nigerian schoolchildren divided into three groups: verbal, nonverbal, and no-training. (Author/RH)

This study was designed to examine the amount of incidental physical science knowledge possessed by fourth-, fifth-, and sixth-grade students in elementary schools in Western State of Nigeria, and to determine what relationship exists between the amount of such knowledge and the pupils' performance on science-related Piagetian tasks. The pupils…

The concepts of distance, area, and the coordinate reference systems were investigated in relation to the displacement volume task among 300 randomly selected primary and high school children in Nigeria. Although results support Piaget's hypothesis, a developmental lag of about two years was observed in Nigerian students. (JN)