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He had wide ranging interests and made contributions in Psychometrics, Industrial and organizational psychology, personality studies and social psychology He was interested too in Sigmund Freud's theories, and also in the statistical analysis of personality. In his 1972 book Fact and Fantasy in Freudian Theory he examined the objective evidence for various ideas of Freudian theory, finding that some, but not all, were supported by the evidence.
Kline, P (1972). Fact and Fantasy in Freudian Theory. London:Wiley
- Cattell, R.B & Kline, P (1979). Scientific analysis of Personality and Motivation. London:Academic Press.