Spearman proposed that his two-factor theory  has two components . The general intelligence , g, another component influences abilities on a particular task . To explain the differences in performance on different tasks, Spearman hypothesized that this other component was specific to a certain aspect of intelligence. This second factor he named s, for specific ability. Regarding g, Spearman saw individuals as having  more or less general intelligence, while s varied from person to person on a task. In 1999, behavior geneticist Robert Plomin described g by saying: "g is one of the most reliable and valid measures in the behavioral domain... and it predicts important social outcomes such as educational and occupational levels far better than any other trait." Rising interest in the debate on the structure of intelligence prompted Spearman to elaborate and argue for his hypothesis. He claimed that g was not made up of one single ability, but rather two genetically influenced, unique abilities working together. He called these abilities "eductive" and "reproductive". He suggested that future understanding of the interaction between these two different abilities would drastically change how individual differences and cognition are understood in psychology, possibly creating the basis for wisdom.Spearman, C. (2005). The Abilities of Man: Their Nature and Measurement. The Blackburn Press. . Impact on psychology
Spearman 's two-factor theory proposes that intelligence has two components : general intelligence ("g") and specific ability ("s") . To explain the differences in performance on different tasks, Spearman hypothesized that the "s" component was specific to a certain aspect of intelligence. Regarding g, Spearman saw individuals as having some level of more or less general intelligence, while s varied from person to person based on the specific task. In 1999, behavior geneticist Robert Plomin described g by saying: "g is one of the most reliable and valid measures in the behavioral domain... and it predicts important social outcomes such as educational and occupational levels far better than any other trait." Rising interest in the debate on the structure of intelligence prompted Spearman to elaborate and argue for his hypothesis. He claimed that g was not made up of one single ability, but rather two genetically influenced, unique abilities working together. He called these abilities "eductive" and "reproductive". He suggested that future understanding of the interaction between these two different abilities would drastically change how individual differences and cognition are understood in psychology, possibly creating the basis for wisdom.Spearman, C. (2005). The Abilities of Man: Their Nature and Measurement. The Blackburn Press. . Impact on psychology
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