Unlike personality, which can be broken down into a number of factors, there is a considerable amount of agreement that a large proportion of the variance in intelligence scores can be accounted for by a single, large general factor: G.

G is also one of the most controversial results in psychology, which to this day causes extreme reactions. It is either seen as explaining everything or as something that itself NEEDS to be explained AWAY. Summarizing 85 years of selection research, Schmidt and Hunter (1998) CONCLUDED if hiring individuals with no previous experience of a role, an individual’s performance on a test of G still seems to be the BEST predictor of his or her future performance.

Unlike personality, which can be broken down into a number of factors, there is a considerable amount of agreement that a large proportion of the variance in intelligence scores can be accounted for by a single, large general factor: G.

G is also one of the most controversial results in psychology, which to this day causes extreme reactions. It is either seen as explaining everything or as something that itself needs to be explained away. Summarizing 85 years of selection research, Schmidt and Hunter (1998) concluded if hiring individuals with no previous experience of a role, an individual’s performance on a test of G still seems to be the best predictor of his or her future performance.