Charles Edward Spearman (1863-1945) studied psychology in Germany and received his PhD at Leipzig. Spearman is noted as a pioneer in psychology and believed in the two-factor theory of intelligence. He wrote his first paper outlining this theory in 1904 with Bernard Hart (Gregory, 1987). Spearman claimed that testing a persons abilites to complete tasks against expected outcomes could be measured and expressed in a mathemactical formula, that mathematical formula is now known as the Tetrad Equation. Spearman believed the results of this mathematical equation could be considered ones intelligence. Spearman believed each ability result could be divided into two factors; first, the general factor or other wise referred to as "g" and the second, the specific factor. The general factor states that if tasks required a similar ability the same expectance of results for one individual remains the same. And the variation of expectance from the ability to another is the specific factor.......
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