This study investigated the effect of 3 kinds of frustration on college students' aggression: task failure, interference with winning money, and interference with attaining a better course grade. The different frustrations did not generally lead to different intensities of aggresion, but all 3 led to more aggression than a control. Although frustration did elicit aggression, the effect was slight. This was explained by the mode of aggression (physical) and the fact that it had no instrumental value in overcoming frustration. It was suggested that instrumental value of aggression is a major determiner of the frustration-aggression relationship. Men were found to be more aggressive than women. Men aggressed more against men than against women, but the sex of the victum was unimportant for the female aggressors. Thus sex differences in aggression occur not only in the aggressor but also in the victum. (PsycINFO Database Record (c) 2006 APA, all rights reserved)