Effectiveness and personality. They begin with the interesting notion that just as political scientists are fundamentally concerned with questions of power and rule, social psychologists are fundamental concerned with questions of authority and leadership. Hogan et al again say that if only corporations would let them, they could choose good leaders for them. Hogan et al. conclude that a Big Five factor model nicely predicts who will lead, and prefers the labels surgency, emotional stability, concientiousness, agreeableness, and intellectance. Surgency, stability, and agreeableness are the best predictors.
Perceptions also count, as specified in implicit leadership theories.