P: there is substantial research evidence to support the claim that peer violence is a response to the deprivation experienced in institutional cultures, such as prisons
E: McCorkle, in a study of 371 US prisons, found that situational factors such as overcrowding and lack of privacy influenced inmate-on-inmate assaults.
L: this suggests that depriving inmates of meaningful activity increases the likelihood of violent behaviour, as predicted by the deprivation model