This study investigated the effects of personality on participation in decision making in a sample of 225 business students. The Neo-FFI scale was used to measure the five personality dimensions of openness, agreeableness, extroversion, conscientiousness and neuroticism. Analysis indicated that personality dimensions, extroversion and conscientiousness, influenced participation. No participation influence was observed for other personality variables. Partial Least Squares modeling indicated that the extroversion and conscientiousness influences were mediated by other variables. The effect of extroversion was fully mediated by an intervening variable representing the choice to use competitive strategies for achieving success. The effect of conscientiousness was mediated by citizenship behavior as well as the choice to use competitive strategies.