One strength of the frustration-aggression hypothesis is that Berkowitz's findings have practical application in real life, eg. the gun control debate in USA. Some states allow 'open carry', where a gun doesn't have to be concealed, but the presence of a gun may act as a cue, making aggression more likely to occur. Therefore research into 'weapons effect; could be used to try to reduce gun-related violence by showing that aggressive cues should be removed from the environment