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 paper summarizes data comparing the correlation patterns of psychometric, social, and demographic variables with intelligence quotient (IQ) and learning potential (LP) scores derived from the Kohs Block Designs and Raven Progressive Matrices procedures. The sample consists of educable mentally retarded special class and institutionalized…