led Spearman to postulate his original general and specific factor models of ability. Spearman applied mathematical procedures to psychological phenomena and molded the outcome of his analysis into a theory – which has greatly influenced modern psychology. Factor analysis and its modern relations confirmatory factor analysis and structural equation modelling underlie much of modern behaviour research. References Further reading Charles Spearman at Human Intelligence External links Charles Spearman on the Portraits of Statisticians page. John Raven, Spearman on Intelligence, 14 May 2011 Charles Spearman, 1927 The abilities of man : their nature and measurement 1863 births 1945 deaths Academics of University College London Differential psychologists Mathematical psychologists Educational psychologists English psychologists English statisticians Fellows of the Royal Society Foreign associates of the National Academy of Sciences Intelligence researchers Presidents of the British Psychological Society Race and intelligence controversy Quantitative psychologists