Psychology in the 20th century has been dominated by the importance given to cognitive intelligence. It has become increasingly clear however, that IQ-scores are not always good predictors of academic or professional success (McClelland, 1973; Goleman, 1995). The apparent inability of traditional measures of cognitive intelligence (e.g. IQ) to predict success in life, led to the development of the concept of emotional intelligence (EI), first labelled as such by Salovey and Mayer (1990). The idea itself however was not new.