p put in situation that caused great deal of physical & psychological stress
guards became increasingly aggressive
5 prisoners released early due to crying & extreme anxiety
only lasted 6 days instead of 14 - conditions were inhumane
means that both prisoners & guards left study in different state to that they arrived in - caused harm
? credible
did not protect p thus breaking bps ethical guidelines
may impact integrity of research as there are more ethical ways to test how social roles affect levels of conformity
uethical procedures means its difficult to repeat