Research on the determinants of intelligence and factors that relate to variability in intellect are discussed. It is argued that studies in this area usually focus on individual determinants and rarely reflect the true nature of the processes through which variability in determinants relates to variability in intellectual development. (SLD)

Bad intelligence tests seem as inevitable as death and taxes. However, new theories of intelligence are resulting in some promising developments. Thirteen approaches to the measurement of intelligence are described, divided into the following categories: classical psychometric; developmental; culture-sensitive; cognitive; biological; and systems.…